It's going to be the hmrc calculated certificate forms that are harder to do. We'll be exempt, but we have to go through the process anyway to satisfy LR requirements.
Getting the right form from Hmrc is probably going to be hardest part! But also I have no idea what to answer some of the questions and even the guidance is a bit vague. I might, for the convenience, pay a conveyancer to do it. They've done it a million times before and get it right first time instead of me having a few goes at it.