Ouch. It works, but, "OUCH!" :x
Thank you, SearedIce. I don't know how I could have made my original post any clearer, but you really came to bat. Your time and patience are to be commended. Kudos! :!:
Now, here's a little extra insight. When I changed the units to inches, I was frustrated because I couldn't get my selection to exactly 5x7. Close, but one of them was always off. Choosing pixels instead, I tried to select an area 500x700 (or 700x500, whatever). Again I couldn't get it exact, but I was only off on one side by one pixel, plus or minus. One pixel is not a problem. Point is, it didn't matter what my units were as long as I knew what I was working with.
Holding the shift key while changing the size was bothersome, but it certainly worked. Not being able to choose my dimension as easily as in Picture It! was also bothersome. This is the one (actually, the one and only) feature I use in PI, so it doesn't look like I'll be substituting Paint.NET for it anytime soon. Oh, well.
I'm looking forward to exploring some of the other features though.
Thanx again, SearedIce.