Honestly, I'd recommend investing in proper booking software from the start rather than trying to piece together a temporary solution. I made the mistake of starting with basic free tools and I ended up having to migrate all my client data later, which was a headache I really didn't need when I was trying to grow my business. The thing is, clients judge your professionalism based on every interaction they have with you, and that includes how easy it is to book appointments. If you're sending them a bunch of available times via email and asking them to pick one, it just doesn't create the same impression as giving them a professional booking link where they can see your calendar and choose what works for them. Plus, as you grow, you'll be so grateful that you already have a system in place that can scale with you. Don't overthink it, just get something solid set up now so you can focus on actually coaching your clients instead of managing logistics.