Could this be a problem with the faucet?
I'm finding I need to set the shower faucet more and more toward hot lately. No evidence of this at sinks or other shower/tubs in the house. Is there something in the single knob shower faucet that can malfunction and cause this? I had a plumber in last week for other things and mentioned it to him. He had no suggestions (not much of a diagnostician based on the other things he did either).
Also wondering if the faucet needs to be replaced, it is a job I could do myself? I have no specialized tools just wrenches, pliers, screwdrivers, allen wrenches...and a hammer if I get frustrated. I can replace toilet innards and hang curtain rods but that's about the extent of my experience... TIA for any advice or warnings!