Fear not – it's very easy
I used to be a maintenance engineer in a hotel about 20 years ago and we hated those things with a passion. Yes it's easy enough to clear whatever is jamming the blade but you will get covered in shit and it's a horrible job.
Couple this with tight access and very sharp blades and it really isn't a pleasant task.
As others have said please make sure 100% that the power is not going to the 'saniflow' or whatever they're called now. If you unjam it and the power is on you will at least lose your hand.
is reversing the motor an option?
Doubt it, the wires you see feeding in will just feed other live/neutral/earth supply which will run to a feed to the motor.