It's not hard to do at home, but the proper tools are rather pricey. People have used large bolts, nuts and washers to create home versions of bearing presses, which is much more affordable though not as elegent.

An intermediate option would be to have the shop press the bearings in, and if you don't trust them to leave the press on overnight, immediately take the frame back from them and use a homemade press to lock them in place until the Loctite sets.