Thanks for all the great replies.
I see now I was getting too hung up on an abstract idea of the perfect ree distance.
And now I know what i was doing wrong with the whoopie slings!
This is all daytime public park practice, so I haven't slept in t yet, just doing dry runs (but I do intend to sleep on the diagonal.
I think correctly attaching the whoopie slings will solve more than one of my problems.
I like the advice about starting with just the hammock rather than the whole shebang, and the advice hanging from everywhere untill i get a proper feel for what works is genius.
I don't see any UK group hangs being mentioned on here, which is a shame. I'm on BCUK but I can't seem to find a hammock sub-forum; i just have to search the entire forum using 'hammock' as the keyword and hope I get lucky - which is why I prefer this place!
Thanks muchly, I appreciate you taking the time to respond.