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The secondary actually does not have to be dead-centre, it is supposed to be offset by couple of mm away from eyepiece (to minimize vignetting).
Would blurry image go away, I can not tell you for certain, but if the main mirror was not collimated, after you are done with it, you will have much much better result (unless mirror is plastic.. but I doubt it :-) )
Check this forum (and web) for collimation procedures, there were plenty of discussions in the past on this subject.
Rough collimation can be done with your eye only (an old black plastic box for film container is great help - you should drill the small hole in the bottom centre, and then insert it instead of eyepiece and look through that hole down the tube.. you have to end up with everything in centre, except secondary which has to be offset by 2-3mm AWAY from eyepiece).
Also, make sure the main mirror is not tightened too hard in its cell... the clips should just be touching the mirror, but there should be NO PRESSURE applied to it. Glass is surprisingly elastic and can very easily be deformed :-)
Good luck..
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