dont just do the front, the back one is junk too. I just replaced mine yesterday.
the front is easy enough to get with just a 12mm box end and a big screwdriver to get the gummy/squishy bushing out. when reinstalling drill/dremel (if you have access to a drill press) the hole in the washer out to 29/64" and you wont require any extra washers for reassembly. if you don't there might be a little slop (i used the Kartboy bushings)
for the rear, remove the heat shield, drop the drive shaft bearing (2 bolts) and you will have plenty of room to work with. no need to drop the transmission.
all together, 30-60minutes. it took me closer to 60 because it was the first time i had ever done it, next time i could probably do it in under 20 for both (i use airtools)