Re: removing lower unit
No, just pull the bolts on the cav plate and exhaust and pull er off.
Don't forget to coat the shaft splines and shaft itself with a good quality marine grease to prevent corrosion and galling.
Do the same for the bolts and torque them with a torque wrench. You are torquing stainless steel bolts into aluminum and you don't want to strip the threads or snap off a bolt.
John