Luckily you only have to complete the amateur snooker career to unlock this.
Just like the pool careers you only need to complete the middle events in the tree. However you may need to complete some side challenges to gain enough stars to go to the next round.
I'm assuming everyone knows the rules of snooker and what balls correspond to what points, if not leave a comment and I'll post them up.
Just like in real life snooker, it is a lot harder than pool, you need to be more accurate with your shots, plan your shots in advance and not just smash the ball as hard as you can because it will not go in the pocket. Try and stick around the bottom end of the table as much as possible, that's where the points are, and if you can't make another pot, play it safe and leave a hard shot for the AI, because unlike the pool careers they miss quite a lot.
There are 8 rounds in the amateur career and because you have a full aiming guide this shouldn't be too much trouble. The AI are not as good as they are at pool.
All the matches are 1 frame matches apart from the very last event which is a best of 3 match.