strange sound from front end

hello TCW members! I was lucky enough to find this site that seems to have a lot of questions anout my 2008 tacoma TRD 4x4! my name is Jack, my truck needs a bearing replaced on the drivers front CV axle. I want to do it my self. Since it was leaking oil from the end of the axle that hies into transfer case i am hoping it is only the seal and not the axle! well here goes ill research here first on a fix it site, then start the project!! Any input would be useful