The written portion is easy if you've read your material. Purchasing the book before hand and reading it is very helpful, but it's multiple choice so it's not bad. Just READ THE QUESTION CAREFULLY, some of them are worded a little 'weird'.

the practical - go slow and think. The most common mistake is putting a finger on the trigger, be VERY careful not to do that. The rest of it is covered in the books, but pay attention to things like checking the headstamp against the barrel markings whenever you're loading, and make sure you know how to cross an obstacle (gun muzzle is pointed away from the point you'll cross at, etc). You shouldn't have a problem if you just remember the steps and basic rules - never touch the trigger till you're ready to fire, never point the gun in an unsafe direction, ALWAYS acts and prove and check your headstamps. You should be fine.