No, you can do those things to a limited degree which might or might not be enough to get you out of a bind. Not to mention all the other things you can't do at all.
Well, I'm a good cook. And none of the plumbing fixes I've done have failed (house with old iron pipes is not my fault). I probably can rebuild an engine if I had to. I'd like a few chances to practice before I do an appendectomy on you. I'm pretty sure I can get it out, but some patients prefer to not bleed to death.
Find something I can't do, that my fellow PCs can't do as well that we would encounter as a party in a Modern RPG.
As a a paraphrase of some famous saying, "the GM don't put more on a PC's shoulders than he can handle..."
So it's less about the actuality of what I can and can't do, and more about the RPG spirit of what I can do as a PC.