Here's a good tip for learning how to play spy: Find a server that goat is playing on and spectate.

or neophyte

clearly you havent played with him because it can be frustrating

You cant sap anything if i burn you alive.

Its nice that you're enjoying pyro so much

That means I'll never have to see you in the pro leagues

Dude I used to know this guy that would always play tf2 high

and he actually did pretty well regardless.

I hate the spy, I think it's because I really need to learn how to use him efficiently. As it stands now, I can't backstab for jack shit. I probably play mostly as the soldier, engineer, and sniper equally. I also like the scout, and sometimes the demoman and heavy. I rarely use medic, spy, and pyro. When I 'can' backstab as spy, it's very satisfying since the enemy doesn't even see it coming. 

Spy is largely skill based, but there's a good portion of the element of luck to the class as well. Here are some efficient spy tips that anybody who has at least 20 hours in the class already knows:

- Like the scout, always aim for taking the seldom used paths on maps instead of weaving through enemy fire (because of this though you will often run into lone scouts).
- Whenever possible swing at the enemy with the knife from a bit of a distance to get the quick stab animation instead of the long backstab. It is many times faster and has a greater reach.
- Become a revolver pro. If you're spotted, backpeddal with it for practice instead of cloaking instantly.
- Cloaking is best used and saved for getting behind an enemy and uncloaking while pursuing them, or cloaking right after a backstab. Try not to use all your cloak getting behind enemy lines.
- Remember that stabbing an enemy in the head or even from their feet (below) counts as a backstab.
- Don't ever cloak and escape into deep water. The enemy can see your air bubbles, giving away your position
- Almost any disguise can have a use in certain situations, even bad ones. Regardless, at least avoid disguising as soldier or heavy.
- Disguising as a scout is a dead giveaway to anybody who sees you at mid-range, but the scout disguise has the smallest hitbox making it more difficult to hit you, and is somewhat harder to judge at close and long range.
- Sniper rifle aside, the revolver is the second-most accurate hitscan weapon in the game at long range and has little falloff compared to pistols or shotguns. Sometimes that's enough to pull an enemy away from their post to pursue you, wasting their time

I don't really have anything else to say other than that for spy. Once you're pro, you can easily break a number of these suggestions and get away with it, but before you can break any rule you gotta know it first...

You cant sap anything if i burn you alive.

Buddy, listen to me, burning a good spy is not that simple, you can trust me on that one, taking that flamethrower and spewing it about hoping you'll burn that darned spy ain't gonna do you any good if he knows what he's doing.