I would increase my labor on the aerial portions of the job be a minimum of 1.50% - 1.75%...possible higher - I haven't seen the location, nor do I know if your crew is adapt at working that high ~ if the guys don't "feel" safe, they will move slower.
Account for EVERY item....from rod/hangers to lamps including wirenuts - every item installed will affect the labor units. Also include the EXTERIOR fixtures.
This increase will also give you a basis for the time needed to rent the machine. You will also need to add some additional time for "drive time" ...once a lift shows up, it needs to be in constant motion(production) or you're wasting money(no production).
Don't forget to include pick-up/drop off costs on the rental, clean-up of the lift, fuel(is it gas ~ gas/diesel/propane? does it need to be plugged in?), etc and be prepared to purchase your own fall protection devices (PPE) ~ while the units usulayy come with PPE, the rental companies HAMMER you on price.
PPE and fall protection requirements may require specific training from qualified persons.