My lazy jacks are on halyards so I can tighten or loosen them. With a full batten main I loosen the jacks and pull them back behind the winches to hoist the main and avoid battens hung in the jack lines. I was on a small Hunter last week that fouled the battens real easy. ven at that it was not toodifficult to have the right touch to get the main up. Without batten cars it didn''t come down all that easy but did contain the main from laying all over the boat.
Going down is no problem at all. With batten cars and lazy jacks if you lower the main she is going down straight and fast. That is really nice.