Hi Mustangs,
It definitely helps to have two people for parts of the install. Solo you will need lots of clamps, and be up and down the companionway many times. Here is a pretty detailed installation
report.
We spent a full week doing the job, with my shipwright working 6 days and myself there for the weekend days. It's fiddly getting the hole enlargement positioning just right, as it is tight to get the teak spacers fit. You'll have a fair bit of trimming to do on the spacers and the headliner teak trim. I also had to modify the fiddle on the top of the forward locker to allow the starboard forward salon port light dog to turn enough to open the port.
Having the drilling/cutting template was a big help, as was my laminate trimmer tool (with a flush-cut bit).
Jay