You need to work on developing your TACTICS. Tactics should come before learning positional play. Its through tactics (or more commonly the threat of tactics) that allows you to control the position and set forth your plan.
By focusing on tactics it will naturally get you in a "attacking" mode. You need to know tactics like the back of your hand. Thats when you will be dangerous, cause at any moment you can explode a position, exploiting your opponents weaknesses.
Start studying 'Mating Patterns', that will help your "vision" so you can have a plan of attack. Once you know what all the common mates look like, you will know better how to create them in a game.
And like I said, learning a more tactical side of chess (pins, forks, double attack etc) will fuel your attacking fire... This is the meat of chess, the excitement!
Tactics, Mating Patterns... maybe take a look at the classic book "Art of Attack in Chess" by Vladimir Vukovic.

Okay fairly silly question, so let me explain.
I'm a fairly simple player. I like the games of Capablanca, Smyslov and Kramnik. Simple, straightforward and usually primarily positional. However, these players are known for, once they get going, becoming fierce attackers.
I play in a similar style but the problem is attacking feels awkward. It doesn't come naturally to me and I often find the attack falling away and losing momentum. The 3-move tactical cheapos are only taking me so-far.
Does anyone have any advice or tips to help me include more of an attacking element to my game?
Any advice would be greatly appreciated.