i have a delta faucet and knob system in my shower. I want to replace the single knob i have to one of those cool temp regulator knobs. currently mine is the plastic, crystal looking knob that turns right for hot and left for cold? anyway i would like to change the spout too because it is loose and i can feel the pipes behind the wall moving when you jiggle the spout? should i be or can i do this project myself as a beginner or should i hire out? thanks for listening and for any suggestions 