Perfect! Let’s design a **deterministic, step-by-step system** for a **new manicurist** (let’s call her *Maria*) who wants to automate bookings, payments, and client follow-ups—with zero upfront cost.  

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### **💅 Maria’s Nail Tech Workflow (100% Free)**  
**Her Needs**:  
1. **Book clients** without back-and-forth texts.  
2. **Accept payments** in advance (no no-shows).  
3. **Send intake forms** (allergies, nail shape preferences).  
4. **Follow up** for reviews/rebookings.  

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### **🔧 Maria’s Tech Stack**  
| Tool | Why She Needs It |  
|------|------------------|  
| **Google Sites** | Mobile-friendly booking page (no website needed). |  
| **Bitly** | QR code for her business card/salon mirror. |  
| **Calendly Free** | Clients self-book appointments (syncs to her phone calendar). |  
| **Stripe Payment Links** | Take credit card deposits ($0.25 per payout). |  
| **Google Forms** | Client intake form (allergies, nail inspo pics). |  
| **Gmail Templates** | Pre-written emails (confirmations, aftercare, reviews). |  
| **Trello Free** | Track client status (e.g., *Booked → Paid → Completed → Follow-Up*). |  
| **Zapier Free** | Connect tools (e.g., Calendly → Trello auto-updates). |  

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### **📌 Step 1: Maria’s Booking Setup (15 mins)**  
1. **Create a Google Site**:  
   - Title: *“Book Your Nail Appointment with Maria”*  
   - Sections:  
     - *“Services & Prices”* (e.g., Gel Manicure – $45).  
     - *“Book Now”* (embed Calendly widget).  
     - *“Pay Deposit”* (Stripe Payment Link for $10 deposit).  
   - Publish → Copy URL.  

2. **Generate QR Code**:  
   - Shorten the Google Sites URL with Bitly → Download QR.  
   - Print on:  
     - Business cards (“Scan to book!”).  
     - Mirror decal at her salon station.  

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### **📌 Step 2: Client Journey (Zero Work for Maria)**  
1. **Client Scans QR** → Lands on Maria’s site → Books slot on Calendly.  
2. **Stripe Payment Link** (in Calendly confirmation email) → Client pays $10 deposit.  
3. **Zapier Automations**:  
   - *New Calendly Booking* → Creates Trello card (*“Booked – [Client Name]”*).  
   - *Stripe Payment* → Moves card to *“Paid”* list in Trello.  
   - *24h Before Appointment* → Sends Google Form intake (allergies, nail shape).  

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### **📌 Step 3: Appointment Day**  
- **Maria checks Trello**: All *“Paid”* clients are confirmed.  
- **Post-Appointment**:  
  1. Uploads nail photos to **Google Drive folder** (shared with client).  
  2. Moves Trello card to *“Completed”*.  
  3. **Zapier** auto-sends aftercare email (Gmail template) + review link.  

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### **📌 Step 4: Follow-Up (Auto-Pilot)**  
- **Trello “Follow-Up” List**: Clients due for a rebook (e.g., 3 weeks later).  
- **Zapier**: Sends *“Your next nail refresh?”* email (with Calendly link).  

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### **🚨 Edge Cases Solved**  
| Problem | Fix |  
|---------|-----|  
| **No-shows** | $10 deposit via Stripe. |  
| **Allergies** | Google Form blocks high-risk bookings. |  
| **Client forgets aftercare** | Auto-email with nail care tips. |  
| **Maria forgets follow-ups** | Trello due dates + Zapier reminders. |  

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### **💡 Maria’s Scaling Upgrades**  
- **At 50+ clients/month**:  
  - Upgrade to **Calendly Premium** ($8/mo) for multiple event types (e.g., fills vs. full sets).  
  - Replace Trello with **Airtable** ($20/mo) for client history (e.g., “Last nail color: OPI Bubble Bath”).  

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### **🎯 Why This Works for Maria**  
1. **No tech skills needed**: All tools are drag-and-drop.  
2. **No missed payments**: Deposits required upfront.  
3. **Clients feel pampered**: Automated but personalized (e.g., intake forms, photo galleries).  

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### **📢 Maria’s Client Script**  
> *“Scan here to book! You’ll pick your time, pay a $10 deposit, and fill out a quick form so I can prep for your visit. Everything else is automated—you’ll even get nail care tips after!”*  

Want me to tweak this for another specific persona (e.g., personal trainer, massage therapist)?