I think my advice would be to try to pick one of the easier options (maybe not the easiest, but probably also not a complex and risky option) and decide beforeh

I think my advice would be to try to pick one of the easier options (maybe not the easiest, but probably also not a complex and risky option) and decide beforehand that you'll see it through until some goal (or perhaps for a certain number of hours). It also helps to have someone who works on a similar thing, to exchange thoughts, vent frustration, and perhaps receive encouragement.