You don't need to be able to see all that well to make up soldered wire to rail joiners like the pre-soldered type. Just put a bunch of rail joiners on a piece of rail to act as a holder. Then clamp the rail in a vice upside down, and flux and tin all of the joiners as well as cut pieces of wire, strip and tin the ends. Then just lay the tinned wire against the tinned joiner and heat the joint until the solder flows. Take away the heat, remove the joiners form the rail and use them on your layout. You may still have an occasional problem with a joiner not making a good tight connection, but with an electrical connection at each end of every piece of rail, you may be ok. Of course, you can't use a joiner with wire connection where you need a gap, but otherwise it should work.
One other question, do you belong to a model railroad club? We have had members of the modular club I belong to have problems from time to time with something they need to do that they are not comfortable with. It might be soldering something, doing scenery on a module, or installing a decoder in a locomotive. We always have another member or more who are happy to help out a fellow member either to show him how to do the thing they are unsure of or to do it for them. The attitude is it is all model railroading and fun. Whether I'm working on my model or someone else's doesn't really matter. We even put together a work party to go 50 mile away into the high desert area to help out a new model railroader who was not sure how to do a lot of things to get his model railroad running.