I'd go straight to 11 speed. The Centaur 10 speed I've got has a really woolly click to the shift, 11 Athena I've tried is much snappier.
BB cups can be fitted with a Shimano external bb tool. You'll need a Torq key (T25 or T30, can't remember) to fit the ergo levers, ideally a screwdriver type one, not a L-shape as its easier.
And an extra long 10mm allen key to bolt the cranks together as its in the middle of the bb, not at one end.
Everything else is pretty standard allen key stuff.