I think you're making a good choice if you use rayon in your first rebuilding attempts. Coils are really easy but wicking does take some finesse and practice. The key for me, using Graham, was listen for or feel a "squeak" as the rayon is pulled through the coil. That indicates enough density in the coil, itself, to wick in there properly. From there it's just a question of trimming the tails to suit the particular atomizer. You might want to invest in a decent pair of cuticle shears just for tail trimming.
Incidentally, there are Sally's stores in most larger towns and cities, very convenient and they also have cuticle shears
and, no, I don't work for ally's or own any of their stock