Welcome to the BABB, Anni. I haven't had the frost problem you describe, so I'll leave that to others. As far a rotating the scope to every point in the sky, keep practicing. I had the same problem at first but have learned how to use both controls to avoid it.
As to your poor neck and shoulders---right angle spotting scope is the answer. I don't know any secrets for using a regular spotting scope that will prevent having to stand or sit in an awkward position to use it. It's a hazard of amateur skywatching. I recently received a right angle spotting scope for Christmas, and my neck is getting better.
I'm sure others will have more and better advice.
Happy skywatching.