Hi Sarah!
Yepp, you need grease since the parts comming clean.
About the time, sometite the parts are stucked bad and it take time and it need heat to release them and that take a lot of time, sometime its smooth to take it apart, and those times its easy to put in the new parts, that take less time. I would say..if it smooth to take it down....about 2-3 hours, and if its stucked...1-2 hours more.
Good luck
Nic
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