They're easy to install. Just drill 2 small holes. Shubb provides clear instructions with their products and I'm sure the other manufacturers do likewise. But, if you have any doubts, take it to a luthier/repairperson.

Expect it to be "in the way" for a few days until you get used to it being there, especially if you play up the neck a lot. After a while your fingers just seem to naturally avoid it. The hardest part of using a 5th string capo is remembering to move it back to "neutral" when you de-capo the banjo. Nothing quite like kicking off the next tune, in G, and hitting a 5th string that's still capoed up to Bb.

Bruce