simao - There's no real learning curve on a -19 Mk IV. But the springs must be replaced with pucks and the cartridge carefully aligned. Fremer has an OK description of cartridge set-up. VTF, once set, shouldn't need to be reset unless there are problems with the arm / counterweight.
What is your location? Maybe you could get help from a forum member or two.
What is your location? Maybe you could get help from a forum member or two.