It sounds like en exact mirror image of me I was doing the same as him 7 years ago,
In 1996 I had upgraded to a G reg Volvo 340 estate. I started with a Leather and Scrim, I thought you had to Scrim first and leather last, each house took about 3 hours, then I discovered an all in B&Q Squeegee, the type without a separate rubber.
Those were the days