Before dropping boat load of money on tools. Get the job first then figure out what he will use everyday. When I started out at the dealership, ( helper) I didnt have any tools. So I borrowed the tech tools. I watched what he uses everyday. I then
bought quality tools like snap at student...
So far I find this better than C-clamp on most small cars
Lang Tools 279 Brake Caliper Press
https://www.amazon.com/dp/B0079GQKDE/?tag=atomicindus08-20
For big trucks, C-clamp is best