Charge by the day or the week, not by the hour. Very explicitly define your scope of work, and beware of scope creep. When providing estimates, plan for 30-32

Charge by the day or the week, not by the hour. Very explicitly define your scope of work, and beware of scope creep. When providing estimates, plan for 30-32 hours/week of reasonable full-time effort. If you estimate assuming you will be able to dedicate 40 hours/week to one thing, you may find yourself working a shitload of overtime. Be firm with the client. If you believe a feature request is out of scope, say something and create a change order. Finally, knock their socks off and they might have a referral for you!