Hey, great question! I'm still a total newby, but (hopefully) learning fast, so here's what i've learnt:
1) Watch others, all the time. See what they do, how they do it, even when they are doing it wrong. Watch them put their kit together and how they pull their scuba unit on.. Does it look awkward, easy, effortless or even stylish? Why does it look that way.
2) Listen, a lot. speak much less., but don't be afraid to speak up and ask questions if unsure. IME, other divers are not just happy to explain what and why they are doing the thing they are doing, but actually enjoy doing that. And this applies to everyone, not just instructors and DMs etc!
3) The kit you dive with is less important than a) how you keep it (ie service it, look after it) and b) how well you understand it and work with it, not against it. Nothing wrong with new kit, but make sure when you change, you fully understand the differences and take time to practice with that new kit
4) Don't be afraid of 3m dives in a pool. If you can hover and do all your skills at 3m, at the depth zone with the greatest change in volume with depth, then you can do those skills at 30m! Just messing around in the pool, even in the shallow end means because your are safe and relaxed, those skills really hit home fast ime.. Yes, yes, you need to be able to clear your mask in cold water, in poor vis, in a heavy current, but if you can do it with your eyes shut, by muscle memory in a 2m hover in your nice warm clear pool, your setting yourself up way better!
5) Take photo's and notes of your gear after each dive. yes, yuor dive computer will log stuff, but simply being able to click on a pic and count 1,2,3,4,5,6 kg of weights on the belt in the picture, and see a 12l cylinder, and your 5mm wetsuit, and those sinky fins of yours, is an incredibly useful memory tool when you start out. When you become a saltly old diver, with 1,000 dives, yes, you'll just know what weighting you need, but right now, like me, you don't, and there is a lot to remember, so jot stuff in a log book, take a quick snap with your phone of your kit, and bingo, permanent record!
and finally, depsite what you'll read on the internet:
6) mostly, there is no wrong / right, but plenty of shades of grey! From things like if you should use your BCD or your dry suit for your buoyancy control, if you should use manifolded twins or seperate cylinders, from piston to diaphram 1st stages, from weight belts to integrated systems, BP&W vs BCD, hell, even the colour of your fins and mask, most stuff in in all honestly is a compromise.. Yes, there are some things that you can do that really are dangerous, but actually, not that many (directly) so what ever your set up, your method of diving, do what works for you.. If someone can come up with a reason you shouldn't dive with your kit in that format, then listen, analyse what they are saying, make your own judgement. Often they have a point, but just as often there logic is as flawed as their line of arguement!
Right, lets go get wet
