The rubber flex lines are pretty simple to replace. You have a banjo fitting at the caliper, and a clip & flair fitting at the other end. You just need regular hand tools plus a set of flair nut/line wrenches.
Yes you will have to bleed the brakes. You may have to bleed the line at the master cylinder even.
It's not a hard job, it just takes a bit of time. The flex lines are available everywhere. Charles