You need a drywall lift, or two ladders and two people, to drywall a ceiling. The insulation goes on the attic side, if you are doing a cold attic. If you are doing an unvented assembly, there is no venting, the spray foam goes on the roof rafters, and then you drywall over that. But you need enough depth to get the right R value for any of this. Eastern Oregon can be very cold.

I was explaining to a friend about a house I designed that was proposed to have stone wrapping the house up to four feet above grade. I further explained that the home owner was planning on installing the stone himself. My friend asked, "Is he experienced enough?"; to which I responded, "He will be when he is done."

The Hotel Del Coronado was built with unskilled carpenters.

...and trained on site, according to this brief history. Construction took only a year.

In the post-WWII subdivision I once lived in, an original owner told me how she and her husband laid their own foundation block by block to save money. The excavations were done by horses pulling scrapers from one side to the other.

How To Install Drywall A to Z | DIY Tutorial - YouTube

Insulation is easy. So is electrical. Too bad you scheduled that.

DH and I have found in our drywalling experience that oftentimes, it looks REALLY good and smooth until the paint goes on and then the seams can show. It's been hit or miss for us and we've tackled several DIY projects over the years. We know enough now that we only DIY drywall when it's in an area of the house that will not get a lot of traffic or discriminating eyes.

However, I will add that smooth walls are the standard in our area so if you're using orange peel or another texture, you have to worry less about seams showing. YMMV.

Do what you can and hire out the rest. Get someone to hang the ceiling insulation and drywall and you do the walls. Have someone come in and mud for you after everything is up. Go with your strengths and hire the rest out because it costs to redo a job not only in time but in materials. You have to recognize your own skill level and work with it.

Walk through a couple of nice homes under construction in the drywall phase, and talk to the hangers and finishers you might find one of these guys to willing to do your house. You buy the supplies, they could do the rest or just what you don’t want to do. Most of the guys doing drywall laboratories are Spanish speaking in my area and they are charging about 30-35 cents per ft to hang and 35-40 cents for finish. Your area might be higher in cost. Talk with 2 or 3 to get a feel on the pricing in your area. The nice thing is you get to see the quality of their work while you talk with them. Each crew will have a lead guy, try and talk with him.

In our small 2 season cottage, we put drywall over the ugly 60s fake wood panelling. Instead of mudding and taping, we did a board and batten look and put trim boards over the vertical seams.