I’d say confidence is the key skill, you probably have 90% of the muscle memory, bike control skills you need to get comfortably aloft and safely back down, more often than not it’s simply head games, the major trouble with riding a trail where there is a jump ahead, is that you know it’s coming, you’ve eyed it up, run through all the potential ways you can injure yourself, and the whole of your run in is spent mulling over your certain death… What you haven’t done is think, yeah I can have that and just ridden it.
It pays not to be too much of a thinker sometimes, certainly on first attempts, it’s the same principle as spotting the right line through a corner, you know what to do, it’s simply a case of doing it and turning down your instinct to avoid risk (easier said than done sometimes I know) but over analysis doesn’t really help, you don’t have to thow down instant 50ft gaps, and all the whips, X-ups and tricks are really just decoration, the odd clean 2-3ft double is not beyond you… Honest…
Being able to precisely pick and place landings and take offs for clearing obstacles like roots, stumps and rocks means you will be able to carry more speed and save energy, and once you’ve learned to read jumps then it’s a skill that can be applied to any trail you ride…