I learned a long time ago that buying the right tools saved way more than their value in damage I created by using the wrong tool, especially when dealing with aluminum engine components. I would never attempt to change spark plugs with 1/4" drive socket components, and I always torque spark plugs to the proper specification. Taper seat plugs, in particular, need to be properly torqued. Many overtorque them which is why they are sometimes tough to remove or take the aluminum head threads with them.

Look up Harbor Freight on the Web and buy some tools including torque wrenches. A lot of their goods are made in China and pros may look down on them from their Snap-On tool boxes, but for the amateur/occasional mechanic you can't beat their value.

Duke