HI & Welcome!
I'm Kat that Wendy referred to. I used to test Gobbles on his pawpads regularly the first few months (he is now in remission), and then went back and forth between ears and paw pads a few months in.
My method: Sit on the floor with kitty sitting on your lap, facing out. Rub the paw pad a little, put a little triple antibiotic w/pain relief on, poke quickly, "milk" blood and test, then apply a little pressure for about 10 seconds, then put more antibiotic on. Put the antibiotic on even if you don't draw blood.
Good luck!