Thought I'd expand my bike maintenance CV to bottom brackets. My Genesis Equilibrium 20 has a threaded, pretty sure it's 105 (brit thread I assume), BB. Looks like a 'piece of cake' to change looking at videos and books. Probably change it for an Ultegra BB and invest in a BB tool; Park version looks good. What could possibly go wrong? Is it essential to torque the BB cups? I have a small torque wrench but not a large one (which are quite expensive). Any risk of crossed threads? Particular grease to use? Should the crank shaft come out easily (with a bit of mallet assistance)?
I just don't want the 'walk of shame' into the LBS!!
Some of the other bikes don't have Shimano, but that's another project.