Hi Andy - and, as Sander has said, welcome aboard.
One thing for sure - do NOT struggle helplessly during your 45-day trial period. Just come straight on-line here at the Forum. And do NOT be concerned that your questions may be trivial. Seriously, ALL of us (even the PTeam members) had a HUGE learning curve to endure and overcome.
But you will soon realise that the Forum seems to be monitored almost 24/7, such is the international dispersion of PixInsight's user-base. Personally, I have NEVER necountered a friendlier discussion Forum than this ANYWHERE on the 'Net, so I think that you will find that anyone who can help you, WILL help you. Even if they are still trying to find their way in the PI world themselves.
I know when I started out here on the Forum, I actually took the time to read EVERY single thread that had ever been posted - but things were a lot 'quieter' back then, I doubt whether many would find the time (or desire) to do that nowadays, and you would also have to bear in mind that a LOT has changed since the Forum started.
So, please, ask away. If I am available (given what seems to always be an absolute dearth of 'free' time in 'my' world) I will always happily offer to link computers with you (I only use the free and excellent TeamViewer) and help you with your first 'driving lesson'. Along with Harry's excellent video tutorials, this should help you get a 'feel' for how to control PI. And, if I am not available, perhaps others will step up to the mark as well.
Most importantly, have fun
Cheers,