Carefully solder the jumper into place, holding it with tweezers. Don't worry about the length of the jumper yet.
In the second picture, a solder bridge has formed, due to too much solder used. I believe this is a good example of failed soldering, of what can happen if you're not careful. But, in this case, the bridging didn't matter (check the first pic to see why) so I just let it be.
The pad that was already a little bit too close now got way too close, and I ended up wiggling a piece of tape as insulation in between the jumper wire and the pad after cleaning the area of flux.