I try to avoid those situations, but every so often I have a weak moment, and I am experiencing that situation as I type. The best thing you can do is NOT look at the big picture. It will overwhelm and depress you. Keep chipping away, but break the project down in to small sections and it will be more mentally acceptable. Looks like I am going to be 2K over my expected budget, so spreading out the work will help there a little. On the plus side, I saved a rust free A body from the crusher.