Amen about the coercion part. that was a source early on in my marriage. I personally am more amiable in the morning. Waking up, I feel like I can take on the world! But at night, I just want to rest and not think of any more work, projects, etc. Unfortunately that is when my Darling Wife is alive and ready for anything. We now use this to each others' advantage. If I want to do something that will be a big change I wait until night when my DW is willing to talk and she has to wait until morning to discuss her ideas with me. Not perfect and takes a little more time for us but it works... at least for us.
This actually reminded me of a Sociology class I took where it was explained that male testosterone levels peak in the morning and tend to fall quite a bit by evening. I guess in that way it makes sense that you're so energized in the morning!
I say, do your project anyway! Maybe get a friend to help if you don't want to do it by yourself? He may come around eventually. Usually when I start a project, the boys start being nosy, and then end up wanting to "help" (aka, show me how to do it).