We’re getting ready to remodel our bathroom ourselves (complete demo) and would like to change the tub/shower configuration and need a little help. Currently our shower fixture and tub fixture work independently of each other so there is no divert. There is a showerhead with a single handle, and then the standard 3-piece tub fixture with a spout and 2 handles, 5 pieces in all. We’d like to change to a 3-piece shower fixture (head, handle w/divert, spout) and want to know if this can be easily done. Thanks.