A foot in the door is what you have before you. Kick it open and get started.
I would love to "have" to learn metal as that is the only thing I haven't done on an a typical install.
I consider myself extremely lucky to have landed in a shop where everyone does everything. You can learn a hell of a lot listening to the senior techs while helping on an install.
And I know many respected members here would disagree - but getting thrown into service as soon as possible was the best thing that could have happened to me. I was taking a service vehicle home in six months and now consider a full 85% of my no cools and no heats to be routine - though sometimes the environments are weird. Unfortunately that means I now sit stone cold sober waiting for my pager to go off - but that just more money in the bank and only for a week every six weeks or so.
Go for it...and the best of luck to you.