If you are by yourself, I would suggest leaving one side bolted up, prop up the front and the other side with pieces of wood and some rags along the bottom edge so it doesn't scratch anything (any more than things already are), replace the parts on one side, leaving the bolts slightly loose, then repeat on the other side, then once both sides are replaced, start tightening things down and checking that the hood is aligned with the side panels and the latch up front. You may want to remove the grille as well, just in case there's an alignment problem, and it jams in the latch, so you have a chance to get at it to work it free (I can't say for sure if you will be able to, but with the grille in place you won't).