New Roof, Insulation Change, Silverfish - Order of Things

I’ve recently moved into a home where I’m redoing my roof with new plywood and shingles for the entire roof. I also need to have an insulation company come and replace all the insulation as we found an infestation of silverfish in the attic and suspect most of the eggs and population are coming in from the skylight and attic since they are mostly around that area.

In addition, the top floor of our house has a boat load of pot lights in each room which probably wasn’t properly sealed in the attic.

I’m assuming the correct order of work here would be as follows:

1. New Roof/Shingles
2. Electrical work to add two new pot lights on top floor (we are removing one of the skylights permanently and adding these additional two lights to match the other existing pot lights
3. Insulation Company to remove all existing insulation and seal every single gap in the attic
4. Pest control company to spray or dust the attic with boric acid
5. Insulation company comes back and installed new insulation in the attic

Is this the correct order? Should I change anything and any comments on spray foam vs fibreglass vs cellulose especially in light of the silverfish issue?

I’m also wondering how the heck I’m going to coordinate all these trades so that all do the work is done in a very timely manner. Any suggestions would be appreciated.

Thanks