Hi,
I am redoing the tile in my bathroom and want to change my single handle hot/cold fixture with a 2 handle fixture... Can I do this myself or do I need a plumber?. My house was built in the 1960's and the faucet seem original.. I do have access from the back and will have access in front once the old tile is removed... Thanks

This is a skill level question.

If possible, it would be helpful if you uploaded some pictures of the existing valve and piping.