I use hair clippers, with the 1/4" attachment. I like the hair clipper over a beard trimmer because the blade is wider. Both work fine, but the hair clippers do the same job in less time...
It can be a little tricky under the nose, so rather than being poked in the nose with the attachment, I usually use the clippers with no attachment. (that did take some practice though...)
For the non-hair area I used the old fashion double sided razor (the one that holds real razor blades.) Since I don't shave everyday, I find that type works best. (any long hairs tend to clog the disposable multi-blade type razors)
Shape is up to you. I shave the area that just has random hairs, leaving the a groomed edge. And make a loop from jaw bone to jaw bone under my chin.