You are fine.

One method I use is to put a wrench (preferably box end) on two bolts and rotate one wrench to loosen while holding the other still. One will break loose. Repeat using two tight bolts until you only have one bolt left tight,

Then I just stick a long screwdriver between another bolt head and the fan shaft to hold it. Put the wrench on the bolt it and tap it with a hammer. The tapping is like a small impact and the bolt will break loose easier.