Erm, i hate to be a killjoy but i wouldnt do that either
If i was you i would ask in the "off roading" section if someone will help you. Meet up with a few people from here at a pay and play and get to know your vehicle properly.
You may have been pretty lucky with your first outing but next time you may not be that lucky.
With regards to your problem selecting low/high box i would post the thread in the defender section after you have tried the following:
Take the gator off your gear stick and work the transfer box lever(the little one) back and forth a few times. It may not have been used very much before you got it and could be a little siezed or covered in crap. either way grease/lube might help.