day before yesterday the fan in my bathroom died. leading up to its death it would start out at a low hum then slowly get up to speed. this morning i was getting out of the shower and it was really bugging me so i took the cover off and cleared about half of the dust and crap out. only to be left stumped. i walked into my local mom and pop hardware store and they didnt have anyone knowledgeable about bathroom ventilation systems. how hard would it be to replace this? could either myself or me and someone else replace this in a few minutes to an hour?