Installing an HT2 Bottom Bracket is one of the easiest jobs to do on a bike, far easier than installing a headset, easier than installing the cranks, if you intend to do the rest of the bike, you may as well do the BB yourself; each side of the BB has rotation arrows, so you can't really go wrong.

Unless you have a headset press, would leave that to a shop, facing and chasing are always shop jobs, as pdlamb noted they cutters are expensive, even a shop will take years to recoop the cost of these, definitely not a tool for the home mechanic.