I attached the listing for the product I’m hoping to use so double check any material answers I give.

Pretty sure it’s fiberglass

Tub is fiberglass as well (current one and replacement one)

Tub is being replaced

Currently no shower door

I would like to do a glass shower door

House was built in 1981

If plumbing needs replacing yes

Not sure about the replace all question

I’ve done a few projects at my house, garbage disposal and dishwasher replacement. Toilet replacements, laminate floor installation. Tool wise I have a pretty well stocked garage from miter and table saw to drills drivers etc.