You will need exactly what it says in the paperwork that they send you, read it carefully. One visit should be enough if you do it right. For full scope you will have to show a big installation like a CU change, rewire, new build etc. and a small job like extra socket or new circuit etc. at two addresses. Make sure you have ALL the documents that they ask for too, in particular health and safety stuff, safe isolation, test certificates etc., the more complete you are, the easier it will be. This takes some considerable effort the first time. The inspectors are reasonable people who will do their best to make it as easy for you as possible, but you do have to make it possible for them to tick all their boxes. I'm also a DI and got through it OK the first time. It's worth the effort to avoid the cost of another visit. Try to pick jobs where you are confident that you are clear on everything and can explain your design and justify your decisions well. You may also need to make some tea if one of your jobs is at home... All the best.
