Best way to tackle this job?

After months of saving, research, and orders I am going to attempt a pretty big job over the long weekend. I do have a little help but we are down a man as my Dad has been in the hospital for a month and a half.

71 Demon.

Replacing cheapo headers with a set of Doug’s.
Switching from power to manual steering with a new box and adapter from pst.
Swapping out stock style master cylinder for newer style aluminum MC with an adjustable push rod from dr diff and also installing line lock.

Am I crazy to attempt all of this at once? Anything I might be forgetting? My thinking was the steering pieces have to be disconnected since they go through the old headers and having the manual box will hopefully save some space for the dougs. I already run a mini starter.

I think I have most of the tools. I do not have a lift in my shop. Just jacks/stands and a set of oil change ramps.

Thanks in advance.