How to make a photo into a realistic sketch using Photoshop?

Hi, i have an image/photo and i want it to be like as if it has the affect it has been sketched by hand, now i have seen/done loads of tutorials that i have found on the web but they dont really look like they have been done by hand.

Does anybody know of a really good tutorial or if you know of a free plugin for photoshop that will give me this affect?

Thanks