Why would you not use a torque wrench if you have one? Overtorquing can be just as bad as under! You want to make sure they are all equal.
I do not torque up when i put my wheels on, i just give them a good turn and the spacers i done the same and never have any problems, others use lock tite on there spacers but again why because they do not use that when putting there wheels on. Same difference if you ask me
On engine parts i have used a torque wrench everytime as things can be broken if over tighened or fall undo if not tight enough.