All that is well and good, but give Caltopo a try. It's free, you can zoom to any scale you want, with all sorts of map layer option (NGS topos, but I like the "map builder" topos better, seems newer). Then you can make Jpegs or Pdf's to your hearts content and load those directly to your phone. Easy peasy, once you get past about an hour's worth of learning curve.
Here's an example, the AT from Hot Springs north maybe 10 trail miles or so, took 3 minutes to generate