90% of my fishing is done alone and I just follow a couple of rules...
1) I couldn't stand wearing a big bulky PFD, so I reached into my pocket and spent some $$$$$ for an auto-inflatable PFD that is lightweight and I wear it ALL the time now!!
2) I always keep my cell with me but some of the back trout lakes I go to will not give me any signal....so, to cover that off I leave the name of the lake with my wife, along with GPS waypoints to the lake and an appoximate time that I will back home.
As far as hooking into a big Muskie by myself, I bought a Frabil Power Catch landing net which essentially is like a holding pen. I keep a measuring tape, bolt cutters, and pliers at hands reach and I always setup my tripod with the camera attached before I even set a line out...
So far, so good