For swapping to a 3-piece BB, you need to get the old one out of there first. Measure the width of the shell on your bike (look it up). And make sure the pitch of the threads in the BB-shell match those you wish to install. A standard thread-pitch is 24 X 1 inch.

So do your homework before you settle into one thing or another.

Oh yes - Last Analysis Dept: This is a job commonly done. And YES! It's very possible.