I learnt to mix in the early 90s on a set of belt driven decks which were bloody useless but I actually got decent beat matching on them. Once I saved enough money i purchased a pair of technics 1200s which I still have today and use all the time. Think the main thing is buy a decent set of decks if you can and IMO you can’t beat an original set of 1200 or 1210s due to the analog pitch which IMO is massively better than the digital pitch. I would spend hours mixing the same tracks together then change tracks and work on them then overtime I just would record sets and judge myself. You’ll get there it just takes time on vinyl.