You don't need to create a self-assessment as it's optional, but you will need to meet all of the ukspec competence and commitment areas when you apply - as it's a self-assessment it doesn't need to be verified so if you are a member you can view this area and complete it if you wish in the Career Manager system.

The accountability diagram can show where you sit within a project or team you are part of, even if you are self-employed as a consultant or technical specialist you can show how you work as part of that project team or within a supply chain perhaps - hopefully this will explain this for you.  If you do not have direct line management, you can also cover this in the application with resource management or budgetary experience.  It could show indirect reporting, or how you offer your expertise to others in terms of the work you are contracted to do.

I hope this helps, but if you get stuck let me know and I'm happy to answer questions via email at: profdev@theiet.org