I don't believe there is an idler pulley on that model, just a tensioner pulley
On my 97 Cavalier I can use a 15mm box end wrench on the spring tension idler pulley. The idler pulley is in the middle of all the pulleys on the belt. It is right under the engine mount and above the crankshaft pulley. It is difficult to get to, but I can put the wrench on the bolt in the center of the pulley and apply clockwise force (looking at the engine from the passenger side fender) to rotate the idler down. This will loosen the belt. You will need to do the same to re-install the belt. Be careful, the pulley will try to spring up when you remove the belt. Make sure you memorize or draw the belt path before you remove it. If you forget, Advance Auto Parts can print a diagram. It was the same for our 2004 Cavalier. I took the right wheel off and lining behind it.... much much easier! (pulley and belt right there)
Yes
M10 x1.50
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do you mean cavalier hand brake?
The idler pulley is located just under the A/C compressor. There is a bolts in the middle of the pulley that needs to be removed and the idler pulley can be removed. Sometimes these bolts stick and my need to be pryed off. You may also want to removed the radiator fans cow to give you some extra room.
2.7
Check the fuse!
check this site out
Providing your cavalier has a 2.2l, this is what your looking at.