Retired tech here- Aside from a vacuum pump very little in the way of tools is required.

Vac the system for a 1/2 hour, blow in 1 to 2 cans of R-134 gas using a cheap kit from Autozone (make sure you have oil in the system first) and pop a temp gauge in one of the a/c vent. Start trickling in gas in 15 second shots and watch the outlet temp. Let stabilize.

Keep adding in 10 to 15 second shots till the temp levels off. Done.