I think you should get one, and then use it as you see fit. They're much easier to use than I first expected, and the finger-pricking is a pretty much a painless non-issue.
I do think your point about losing weight and eating right is quite valid- better you do that and don't test, than you test all the time and don't take care of the fundamentals, but then, why not try to lose weight and eat right, and test to see how you are doing? I don't test myself much, but that's because I've tested most foods and drinks I come across and I know what affects me. If anything anomalous happens though, I like to do a test and get some data- A few months ago I had a bad fall- took a test- didn't spike me at all- that's worth knowing (my diabetic dad had a fall and his bg went up to 20 something). I went out last weekend and had some carby food- thought it would be OK coz I had some gin to keep my bloods down. 2 hrs later, 9 point something BG, so I know not to try that again.
Like I say, I'm much less of a 'tester' than most on this site, but I don't see any disadvantage to having an accu-check or something for your reference