Those are some seriously well-paid jobs for a student. |
And as a general rule I wouldn't stress too much about getting everything 'right' and completing everything 100%. You can't do it on your first playthrough anyway, and I personally think I had more fun just muddling along than I would have by constant reloading or having my nose permanently stuck into a guide.
If you really want to go completionist you could always do a speedrun on New Game+.
PSN ID: finn1