You might also want to put "wire guards" on the wire above the crimp. This helps the wire to last longer as the clasp/jump rings slide around. You need to get a set of crimp pliers, these have two areas, one for doing the initial crimp (with an indentation between the wires) then a rounded area for folding the crimp over on the indentation. They also make putting the crimp covers on easier, just put the cover in the rounded area and then after putting the crimp in the cover, gently close the cover. You also can run the wire that you brought back through the crimp through several beads before cutting it off, then you don't have a spike sticking out of the crimp.