New guy with question on water pump disassembly

[19fifty4]

Actually several questions…
1) How much force does it take to remove the fan assembly from the shaft? I’ve removed the cotter pin + castle nut and the fan assembly is holding fast. Am I missing something else or can I be less gentle with it.
2) In rebuilding / reassembly, are the packing, bearing felt, and bearing retainer, typically the only items needing replacement to address a leaky pump?
3) I currently have the exhaust manifold & head removed from the block repairing another issue. That work is complete and ready to be reassembled. Should I wait until I have the water pump ready to reinstall in the head before bolting up the head and exhaust? Or can I go ahead and get those items reassembled in the event I need to wait on water pump parts from the supplier.

I have a 29 Special Coupe that is mostly stock/original but it does have a 4 blade fan. I'm using Les Andrews Vol. 1 as my guide but would appreciate some feedback from you guys.
Many Thanks,