What is the best means of access to solder a copper t-joint? ...
Use a wire brush to completely shine the joint. Apply flux to the joints. Key is to steam the part where on earth you want to draw the solder. In other words, you would heat the fitting not he pipe.
hire a professional plumber so you do not do it inappropriately and get a overflow inside your wall.
Trust me - that sucks!
Answers: It satrts with sand the pieces well and getting them remarkably clean, next use flux on all parts to be soldered. Use a propane torch for small fittings (1/2") fry the joint thoroughly, slap solder on joint until you see it defrost. Then push solder into joints until solder drips out. Start on the lowest point since warmth rises, complete each solder point, next wipe with a cloth to ceal off eccess. Allow mutual to cool for a minute, then trun on hose down and check for leaks.
Yoda out