I am in the same process of gathering info on this birfield repack operation. There are pretty detailed write ups here on this forum about how to do it. Look under the search option for birfield repack or front axle service and something should come up.
I have seen times of up to 8 hours to do both sides but after the first side is done the second goes much faster. I haven't done it yet so I don't know. I am in the process of gathering tools for the job also. Since you are a mechanic you might already have some of those tools; torque wrenches , floor jacks, large socket for spindle nut , seal remover , metric sockets. There is tons of info on this site!! I love it.
Mark
I have seen times of up to 8 hours to do both sides but after the first side is done the second goes much faster. I haven't done it yet so I don't know. I am in the process of gathering tools for the job also. Since you are a mechanic you might already have some of those tools; torque wrenches , floor jacks, large socket for spindle nut , seal remover , metric sockets. There is tons of info on this site!! I love it.
Mark