It really is not that hard. You don't need statements from anyone at all - you put their name on the form and CL will contact them to confirm you have split up as a couple.

Once you see the forms it is plainly obvious what they want you to say.

Complete separation of bedroom arrangements - sex, sleeping.
Preparing own meals, although we till ate dinner together and this was not an issue as we ate with the children.
No joint banking accounts and separation of bills.
Division of laundry and bathroom, so you are not washing each others' clothes, and you both clean the house and do the chores for yourselves...

Honestly, not that hard if you actually HAVE separated - not just not romantically intimate any longer, but actually split up.

We did it for 3 months, and had absolutely no issues in having it approved.