Long story short, use the proper tool for the job.
I ordered the pliers and hog rings from JBG when I recovered my seats. Was about 2/3 complete with the second seat when the handle broke on the pliers. They were just cheap pot metal and were doing the job very well, mine just had an air pocket in the handle but never would have seen it unless they broke.
Anyway, tried to finish up with needle nose pliers.....bad idea.....borrowed a set of hog ring pliers from a local upholstery shop and had the seat finished up in no time.
BIG TIP on covering your seats. Take your time, use new pads, and heat up your new covers before installing them (laid mine out in the July sun). Patience will go a long way on a good install.