I’ve successfully finished my first year of distant study of civil engineering. Some fun, some hard work, as the distant study is mostly based on working out a lot of exercises. You can either actually make the exercises or you can copy them (which is formally disallowed of course). IMO the first way, although sometimes very time consuming, is better than learning the subjects by repeating exams and it is definitely much more effective measured by the actually gathered knowledge.
It proved to be manageable, but I can’t recommend combining a regular job, building your new house by your own hands, extending your family, studying a school, etc. It’s somewhat demanding :-). I hope I’ll be able to manage things better in the next years.