On the one hand VTA is the easiest of all. Is the cartridge body and/or arm pretty much parallel to the platter? Then you are done.
But on the other hand very small, and I mean micro small, adjustments in VTA are pretty easy to hear.
So what happens is, if your arm makes VTA easily adjustable, and if you try it and hear improvement, then you can spend as much time as you want getting it perfectly dialed in. Some even do this for each record. But if on the other hand your arm makes VTA adjustment a hassle, or you don't hear any difference, then don't worry be happy.
Pretty much everything about turntables is like this by the way. Very fine adjustments in VTF, within the recommended range, make an audible difference. Every single aspect of cartridge setup is like this. Some guys throw their hands up and say here take my money you do it. Others roll up their sleeves and get the job done. The job by the way being endless- but you are the boss, you write your own checks, pay or don't pay the bonuses, and so of course its entirely up to you whether you fire the bum or give yourself a promotion.
millercarbon, CEO, President, and Chairman of the Board.
(Fired from more jobs than he can count!)