This is a great thread starter, Peter.
First and foremost, though:
it is a true one step forward, two back learning experience
Look at what you can do now that you couldn't ten flying hours ago - yes, there are challenges, but you've proven to yourself that at worst you've managed
two steps forward and
one back, 'cos you've made progress!
Shawn is spot on (unsurprisingly!) - visualisation is everything. Practice in your mind over & over again until you are 'comfortable'. The benefit of this is that you can take your time, 're-fly' the part that you aren't happy with and guess what: it doesn't cost a cent...
My personal helicopter 'Thing I Couldn't Do' came a bit later, when I was converting to Sea Kings; I couldn't properly suss out the full flare recovery. I hadn't had a problem with engine-offs on the Gazelle, but the SK flare technique was sufficiently different that I found it a real struggle. Once I'd joined my first squadron I pestered my more experienced colleagues to beast me with PFLs at every opportunity until I got it worked out, helped significantly by their advice. By the time I finished flying the mighty King one of my favourite exercises was PFLs from various whacky positions finishing with a FFR (usually) over a designated spot, and encouraging first-tour pilots to challenge themselves in the same way. It seemed very odd by then that something that seemed so natural had ever seemed so difficult, but I never forgot that it had been so and kept that at the front of my mind when flying with those new pilots.
So my suggestions:
1. Ask for and read as much advice from others, especially those with more experience, as you reasonably can.
2. Think hard about all of it (not all will necessarily be good advice!).
3. Fly the exercises in your mind until you are confident it will work before you do it for real.
4. Try very hard (and it is hard!) not to beat yourself up over something that doesn't work for you yet - keep following suggestions 1, 2 and 3 and it soon will.
My flying hours are comfortably in 4 figures, but I still carry a notebook in my pocket to record my sudden thoughts or 'top tips' from others which I can then think over later, applying points 1-4 above if necessary.
Good luck!
Louis
PS I might give JLS a try...