Hey, can anyone give me some advice?

I am fairly proficient with guitar and banjo, but I've just recently dusted off the trumpet I played in middle school band several years ago, and needless to say... I'm out of practice.

So I was wondering if there is any advice you could give for someone who is going to trumpet with a background in guitar, or if not, just any advice you might offer for learning how to play trumpet riffs with a rock band and learning how to pick up on them quickly. (Because I don't have perfect pitch)

Please offer any advice you have!

Thank you!