RE: trainer?
One thing about having a trainer. If you keep it (meaning, if you don't sell it), you will find that from time to time you will want a relaxing afternoon just flying and getting back to basics. It's always good to keep the good old trainer around just for that purpose.
So, to answer your question, yhea, get it, fly it, learn good technique, then move up, but never let go of your trainer.
CGr.