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Just like everyone else has mentioned, you need a decent autocollimator. That's the point where you fine tune collimation generally with very small tweaks. Collimation needs to be fairly decent before you use the autocollimator. I used to place a match head into the light path during fine tuning with the autocollimator and tweak until the centre reflection flushed with the colour of the match head. Usually you'll see converging match stick reflections that don't quite meet in the centre when collimation is very close. Minor Secondary tweaking will generally solve this problem.
I didn't see it mentioned previously but it probably was - make sure to check that your focuser is spot on. If it's not, you may need to shim it until it's perfectly perpendicular to the light path. Some people will spot the tube immediately opposite the focuser to check this with the secondary removed.
Good collimation is very rewarding. Stick with it.
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