If you have the time, a place to work, and a few basic tools, the absolute best person to do the work is you
. Nobody else will ever
approach your coach with the same level of care that you will.
Packing the bearings and doing the brakes aren't complex, just dirty. If you can take apart a ball point pen and put it back together so it works, you can do this. I'm sure there's threads and YouTube videos up one side and down the other about how to do both. Plus, you can use the money you save to buy any tools you need, so you're ahead of the game for next time.
Then you get to come back here and brag about it, too!