As regards learning o fly. What I have done is buy a FrSky Tarranis controller and use it on my PC with the following simulators, FPV Event, FPV Freerider, LiftOff and theres a free one thats not that good but ok, DRL Simulator. I think the best one, for me anyway is FPV Event which you can buy for a one off fee of £50 or a monthly fee of £5. After learning to fly Acro on these simulators I can now fly well, in the simulators, which gives you an opportunity to get the muscle memory built in to the thumbs or fingers (Thumbs for me) and saves you smashing your drone to bits learning.
I am now currently building a Crusader GT2 for my first drone, ha ha ha , I know, madness! but decided to dive right in.
After 3 weeks of practice I am currently ranked 157 on FPVEvent on the advanced drone Pro circuit so with any luck I will be able to fly the drone in real life. Obviously going to take it easy first off. The first week is a nightmare (Well, it was for me) as I never thought I would get the hang of it but then all of a sudden, muscle memory kicks in and it gets easier from there.
As regards building, the real difficulty is the soldering. Do not use a cheap soldering iron, get a good one, not a butane one,lol. And use 60/40 solder, 60 Tin and 40 lead, it will definitely be easier. You will have to get the solder on amazon or ebay as I think its now illegal to sell it in the shops in the UK, but I could be wrong. Or just get a second hand one of Ebay and smash it about.
Hope that helps.