There are loads of tricks I can't do, including some like the comete that I found I could do for a few weeks, and then forgot. But the multi-lazy is something that I have been spending time on trying to master for 3 summers now, and the best I can typically do is 3 rotations before I run out of sky. - That's the one I have spent the most time on and not improved much.
...But in the meantime, as a side effect of this, got to be a dab hand at what is now called the Goff, and the lifter is looking promising.
Another trick that needs a break-through to get right is the coin-toss, in the sense of one that goes from one wing-tip on the ground to the other wing-tip on the ground. All my coin-toss attempts turn into axel take-offs. ...But I haven't been devoting 10s of hours trying to figure this one out, yet.
And then there is the back-spin. Excepting with the widow-maker, all my back-spins either suffer a stall on the non-pulled wing mid rotation and fall out of the sky (a more recent failure mechanism) or turn into lateral rolls. On and off for the past few years I have spent 10 and 20 minutes at a time here and there trying to figure this one out. No luck so far.
Because of failing at multi-lazies and failing at back-spins, single rungs of Jacob's ladders started coming along as a side-effect.
As for the taz, that came naturally, as Tom says, from first doing it on a kite that handed them out, and then practicing with other kites. - They were so easy for me that I didn't think to show them off when flying with other experienced kite flyers. It was only when I claimed to be able to regularly do sets of tazes, and a senior UK forum member who had seen me really struggling with mostly multi-lazies rubbished my claim, that I learned the trouble others were having with such an "advanced trick". - Got me a lot of heart-ache - that off-hand posting about the taz.
My late partner couldn't do an axel for 3 years. And what was as bad, I who could do an axel from within a couple of months from us starting flying, couldn't figure out where she was going wrong. Then one day at a festival, another flyer showed her how to axel at the edge of the window (similar to the Andy Wardley Eezy Peezy method, which we had already read all about and she had unsuccessfully tried), and she suddenly knew how to axel.
One thing that I quickly discovered and could do for the first two years I was flying, was a certain multi-axel tumbling onto the kite's back and front trick, which I have since learnt is called a torpille. - It looked really neat, and I was very happy with it. But, because I had learnt it early on, I assumed that it was easy and that it wasn't a recognized trick, and didn't practice it. And now I couldn't do it if you gave me a day off work in which to have a go.