I'm currently in the second week of an approved APS course, busy revising for the written summatives so I can't enter a lengthy discourse. Suffice to say that there are a number of cheap or free programs around that can provide vectoring practice for multiple targets. Once you get to the third or fourth day on the sim, the runs are tailored so specifically to the subject airspace using precisely set rt and procedures that I can see a real problem unlearning bad habits. When the red mist comes down it is too easy to slip back to familiar but incorrect phrases and methods. My advice would be to perhaps get a little vectoring practice if you feel you need it, and then get on an approved course with an open and empty mind, ready to fill it with the copious amounts of specific instruction and guidance on offer.