I have the spark plugs.

But I haven't attempted it yet because I don't have a torque wrench (and don't plan to buy one) and I wanted to get someone's input first.

So, if I screw in the plugs by hand, should I turn it about 1/4 turn or 1/2 turn with the socket wrench. How much would it take to get it to the approximate right torque?

Please advise.

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'90 300E
Lowered with Eibach Springs
Mouldings and bumpers painted body color
Clear front corners
94/95 W124 Taillights