i'm a WOWer. i can take advantage of a warm spell in spring, plant some tomatoes, set up WOWs, and then basically forget about them. no worries about that last blizzard we usually have late in May. no need to be watching out for late frosts and laying protectors at night and removing them in the morning everytime there's a warning.
i plant all the tomatoes in the ground first. then i set up a filling station outside but near the bed. i put a WOW on an overturned pail, turn on water, fill WOW tubes with water nonstop, turn water off, grab WOW by the top edge (same way when getting a WOW off a plant), quickly carry it to the bed and put over a plant. my best timing is 32 WOWs in 2 hours. the important part is to get comfortable and sit on a stool when filling up. difficult part is water is cold and can't really use gloves so hands hurt.
--meg