Are you looking to sell the whole collection as one lot?
What size is the collection? 20? 200?
If you want to sell individually, homeworkshop.org.uk would be a good place to list and sell.
For any that have the title on the spine, line them up on a shelf and take some good photographs. That is a lot quicker than listing by hand. Review the photographs for clarity before using as part of any sale listing.
If you upload the photographs here, you would receive some honest opinions of their commonality, rarity and maybe value.
Tee Publishing sell rare and out-of-print books in this field. I have no idea if they buy collections. G&M Tools also have a lot of similar books for sale on their website, but how they obtain them, I have no idea.
Be aware that in using a commercial dealer/seller, you will likely receive 5% of their value, but it will be cash in your hand that day. You can increase that value by selling them yourself, but you will still have some left after a year of trying.