Litigation involves doing quite a few unpleasant tasks. Some are boring, some are emotionally bruising and some are just difficult. This is as true for professional representatives as litigants themselves.
To some extent this is unavoidable and the only useful advice is that these things are tough but you need to do them anyway.
On the other hand there are quite a few techniques that make things easier. When writing something difficult a good trick is to start writing in the middle. Just write the easiest or most interesting bit of the document and move from there. There is no rule that says that documents should be written from the beginning to the end.
Once you’ve made a start, you’ll probably find it easier to write the rest of the document.