Repacking Front Axle Bearings on 86 S-10 Blazer

I was just underneath my 86 S-10 Blazer which has 191,000 + and I noticed that there was grease emitting from the rubber boots on the 4 WD axles. Is this something I can repair myself, or is it a shop item?
Thanks to the posters who advised me on how to fix the leaks on the front differential and the heater blower problem.

Thanks in advance!

plowshare

are the boots rip or anything like that at all?