Hi Phill,
I definitively recommmend you Fingerpicking etude. Only playing for 10 weeks and this one seems reachable.
The piece sounds nice too even at slow speed. I play it at 40 bpm instead of 90. So u see, you are not the only one to struggle haha π
For difficult parts, all i can recommand is to isolate them and play them over and over again… Till they become easy. Also work it very (very) slow first π just saying π
Happy strumming to you !