I have never used auto clutch myself, tried it but it felt way too easy
I think a lot of people don't realize they could have a clutch for not very much money at all. All you need is a second crappy steering wheel, it doesn't have to have FFB or anything. If you have a crappy old console (PSX) steering wheel you could use the pedals from that. or an old Game Port wheel your mate has but does not use anymore etc etc.
PSX controllers and Game port controllers can be connected to your PC via these
http://www.rockfire.com.tw/ (click "Product" then "Accessory" and its the last two on the page)
I bought mine at Maplin for less than 15 quid.
Now, get with the analogue clutching