Hey!
No problem at all, I'm glad to hear it is useful!
On knowing whether you have done a task "right", I think this is really tricky to actually know and often something that comes with practice and feedback, rather than there being a single model answer. In my experience, a "good" answer is usually one that is clear, well-structured, and actually answers the question that is being asked. If your supervisor can quickly understand your reasoning and use your work without having to rework it significantly (though no-one is expecting it to be perfect on the first try!), that is usually a good sign that you are on the right track. It often helps to ask your supervisor what specifically they are looking for, and noting that down in a list - I would always aim to ensure that my answer ticks everything off whilst also being concise / easy to read.
If you are every unsure, I'd try to take a bit of a commercial / common-sense approach - think about what the client's main priorities would be, what they actually care about, and what they would want to know. This can really help give you an idea of what to include (and just as importantly, what to leave out), especially if it is client-facing work. Again, I would always double-check with whoever has given you the task too - sometimes they might have done research already, and will ask you to leave out specific sections to avoid repetition.
For drafting and written work, I definitely didn't feel confident at the start either (+ didn't even know where to start!). What helped me most was looking at precedents and previous examples where possible - even just seeing how things are typically phrased and structured makes a big difference, and can help you make a start on the work. Resources like Practical Law and Lexis are really helpful here, and firms will usually show you how you can access them during the scheme. I found these were a great starting point, particularly for drafting exercises, and you might find examples within the firm's case management system too (if you have access to that). I would avoid relying on them blindly and make sure that you tailor it to the task you have been given (rather than following it word for word), but they are really useful for understanding structure and making sure that the style is correct.
If you are really stuck, I'd also suggest reaching out to your trainee buddy or a trainee in your team. They might not be able to give you the answer itself, but they can point you in the right direction - for example, suggesting useful resources, precedents, or even just how they would approach the task. On all of my schemes, I found that people are generally very happy to help, and it shows that you are being proactive rather than sitting stuck.
I would also encourage you to keep a note of feedback that you receive and refer back to it when you are given any future tasks - I found that a lot of the same themes came up, so I could focus on those areas when completing the current task.
I really wouldn't worry too much about getting it completely perfect straight away - your supervisor will understand that you likely don't have much legal experience, and showing that you can take feedback on board and improve is just as important.
I hope that helps, and best of luck with the scheme!