It is not difficult, just awkward and time consuming. Replacing brakes lines is not a lot of fun. Even less if you have to crawl under the car. Not being a fan of jack stands, solid wooden blocks make me feel a lot better when I could be getting squished.

First thing to do is check to see if the bleeder screws break off. If they do you will need a caliper for each broken screw. If the bleeders don't still have the rubber caps you can try squirting a little penetrating fluid in each bleeder before you break them off. It won't hurt to spray a little on the brake line joints. Use flare nut wrenches on the flare nuts. If the bleeders open, there are only two joints for the replacement line.

Greg