Geda, you've come to a forum to ask advice from a whole mix of people but you are unsure about going to someone who has spent years and years studying mountain bike techniques, ridden with and analysed some of the best in the world, developed analysis skills to help in every riding situation, has a bank of coaching progressions that will sort out pretty much any problem in bitesized chunks, ….
I can't vouch for other instructors who are mentioned on here but i know some get really good press, and i can tell you for sure that the guys who work with me at CycleActive have spent a huge amount of time not just working on their personal riding, but developing their coaching too. Our last staff training day was spent working on two drops and two jumps at Ae Forest, taking video of eachother as we worked on different approaches to not only to the jumping and dropping, but to the moves that form part of it and how to break them down and explain them when working with clients.
Our clients come from all over the world and from all walks of life. We get super keen dirt jumpers, trail riders, elite level racers, total novices and american billionaires. The competencies (both technical and mental) they come with are different but we have the skills to make them all progress. That's why we do it – so don't be put off by a video, good coaching is a truly amazing experience and the biggest feedback we get from people is "why did i wait so long before doing this!"
Give us, or someone, a call and we'll get all of your biking problems sorted out.
Cheers
Chris@CycleActive