That's a pretty big job, if you're not a mechanic.
in general (I've not done one on an Aveo)
1. detach intake and exhaust manifolds from head
2. remove sparkplugs and move all wiring aside
3. Remove cover from top
4. Guessing overhead cams, remove belt/chain
5. remove head bolts.
6. pull head. I used to have a special tool that threaded into plug holes and pressed down on head studs. Otherwise, we'd end up lifting the whole car by the head and beating on it to get the head off.
7. clean gasket debris off head and block.
8. If needed send head out to be milled to flat.
9. place head gasket, add head, and torque to specs.
and the rest of what you did to get it off, in reverse order.
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