Rick, on the floors for sure either use Schluter Ditra or Strata Mat uncoupling membranes. Costs more but you won't get cracked tiles or grout joints after. When soldering copper when the flame turns green it's hot enough. Hold the flame on one side and when the solder starts to melt held on the backside of the joint is another sign it's ready. Use Kester soldering paste in the joint before you start. Make sure the copper is clean and bright. If you have to use emery cloth to clean the pipe up first always go around and never up and down. If you have a leak, pull the joint apart and stuff a wad of rolled up bread dough in the upstream part of the joint. Otherwise when you try to resolder the joint any water in the pipe will form steam which will blow streaks through the new solder job and you will still have a leak. Take any screen off the appliance at the end of that run so that the bread will blow out without plugging the spout.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.