I don't have ADHD, but I used to struggle with time management due to other issues and I found that todo lists are a big help.
I actually don't use fancy software, just a .ODT with a bulleted list of projects, then smaller bulleted lists of tasks for the project (with another level of indentation for when I work on the task itself).
Helps get over the "gulf of execution" to start something or feeling like you're spinning your wheels and reassure yourself "it's ok you're not 'done' - you've done a lot to move towards being 'done'"
I actually don't use fancy software, just a .ODT with a bulleted list of projects, then smaller bulleted lists of tasks for the project (with another level of indentation for when I work on the task itself).
Helps get over the "gulf of execution" to start something or feeling like you're spinning your wheels and reassure yourself "it's ok you're not 'done' - you've done a lot to move towards being 'done'"
[1] https://en.wikipedia.org/wiki/Gulf_of_execution