More insructions.
Here's another site on the SKS trigger.
http://votefordavid.########.com/2008/04/improving-trigger-on-sks-rifle.html
I would say it's do-able and worth it. Only read through / watch the instructions thoroughly and start only when you understand exactly what each part does and their relationship to each other.
It's not quite like most triggers, but with a bit of patience you CAN make a very nice, smooth and crisp trigger. Pull weight will still be a bit high (and needs to be), mine is in the 7-8 lbs range.