Alterations — Shortening a pant's inseam

This Reddit comment says it's easier to create jeans from scratch than to reduce the inseam on an existing garment.

How to find local alterations specialists.

So:   We have some pants that are close, but still really have some problems. What we need is to make a pattern from a specific piece of clothing, and then modify that pattern to fit T's body better. Given that I don't understand pattern making, are there any services that can help with this part?

• This Reddit comment suggests looking for someone who will do individual pattern alterations locally — Local sewing/alteration shops, local sewing guilds, or FB or CL groups.

Local alterations specialists

• QueerCustomSuits.com AKA Uncommon Closet