Definitely agree about talking to the retailer before you do anything else. Doug will be a great help too and he's local to you.
Offer still stands to run it on my railway if you wish (Doug too...

). I have some Accucraft locos and it can help to see others in steam and talk to people who know what to look for/listen for/feel for/smell for (not usually taste for)... because we have done it quite a bit. I know when I was new to it all, that really helped me - and still does. Good luck with it.