Solid Hardwood, Engineered and Laminate Flooring - Subfloor material for Pergo?

:eek: I am taking a big step this year in laying pergo laminate over approximately 600 square feet. I have never even used a saw prior to this, but in the last few years I have supprised myself in finishing projects I didnt think I could do.
So far I have finished my pantry and most of my kitchen. Its been going very slow so far with kitchen glue and silicone for this water prone area. I just now noticed there seems to be a quarter inch ply wood under the kitchen linolium. This extra plywood is not under the carpeted area which transitions to the eating area/den.
Will I need to build this carpeted area up with more ply wood or can I simply put in a reducer strip?
Extra plywood is an extra expense/headache I had not anticipated.
So far I have been able to complete all of my work with a table saw. Will I need to purchase another saw for the plywood?

For one job you can get by with a table saw. But a cheap circular saw and jigsaw will help. Get a jigsaw at the bare minimum.

I would remove the vinyl and 1/4" underlayment to avoid an unsightly transition there. But do know first if it has the potential for asbestos before you start cutting. Think resale value on decisions like this.:)