i second Katzkins. Just finished my 07 Civic with them. WHOA! It's like having a new car. Anyway, Clazzios seem to be great quality, BUT, I want to say they are just "covers", unlike the Katzkins which are a REPLACEMENT to your factory cloth covers.
Someone correct me if I'm wrong.
Covers: placed over the existing cloth/leather. No special tools needed.
Replacement: removal of existing cloth/leather, tools such as hog ring/pliers needs to install them (just like an upholstery shop. Like someone said, if you are handy (and have patience), you can do it yourself. Just be prepared to curse in German repeatedly).
link:
https://katzkin.com/katzkin-vs-seat-covers/