I may be the only person on this thread who can say this... but I have brand new windows all through my house, and 3 of them are from Lowes, the rest aren't.
After the window guys installed the 3 from Lowes I told them to stop. I then called around and I arranged my primary question. My question went from "How much?" to "How well are they made and are they Lowes crap???". My bedroom is a corner room. We had the 2 brand new windows for the bedroom installed from Lowes. OK, read this clearly... The window in the bath connected to the bedroom is from a local guy. It's NOT from Lowes; it's the same as the rest of the windows in the house MINUS the 2 in the bedroom. Our bathroom does not have a door. It has a keyhole shaped entry way and a thick Moroccan tapestry with a pull rope. So if I open the tapestry completely, it's as if the bathroom is part of the room. The heat/AC vent is under the Lowes window, so it has an advantage. Even with the vent directly under the window, the Lowes windows will be HOTTER in the summer, and COLDER to the touch in the winter than the other window in the bath!!! The one in the bath is on the same wall facing the sun the same as the one from Lowes. We had 3 of the Lowes windows installed, and NONE of them work!!! They all are a pain in the butt to open or close, and they are a nightmare to lock. The windows from the local guy are like a 2009 Mercedes and the Lowes windows are like a 1979 Granada.
It's like I've always said... people who know quality avoid Lowes and Home Depot. People who don't know any better do otherwise. The guys in our area who shop at Lowes for windows are jacklegs, and DIYs, and the guys who are professional will quickly tell you that they would shut down shop before they would sell you a Lowes window.
I'm a plumber. I should have known better. I won't buy or install their crap. It's cheaper made, the parts are more expensive and harder to find, and the quality is a joke. Even the Delta faucets are cheaper made than the same model Delta at a reputable supply house. The ones at Lowes have a retail letter beside the number. They have plastic parts and thinner copper tubes.
My electrician said that Lowes sells factory seconds on electrical, and he said it was suicide to buy electrical from there.
I can also tell you that when you look at the windows from outside the Lowes windows look a LOT cheaper. The work was sloppier as well, but that wasn't Lowes fault. That was just guys who were less professional. I asked them before the job to not use Lowes windows. They insisted they were just as good. I should have went with my gut feeling and bought from the local guys who sell a higher quality window to begin with. I only saved $25 per window. It was so not worth the headaches.

I plan to replace the Lowes windows in the near future. As far as whether ot not he can do it, I'd say just pay someone. They earn every penny. It's not as easy as it looks.