What is there to explain? Just truncate your already-existing-catalogue-sqlcrap, query in the two things he tells you to then import the sql file(s). Then you just drag and drop the hof furnis into your hof furni folder, add the c_images and bob's your uncle. It's all there.He doesnt fully explain it :/
---edit--- ill just make new sqls of Jess Catalogue and have it in my Catalogue