i did my first flush last night and was just as nervous as you are now. perservere and stay positive.
from what i have read, make sure you don't mix the olive oil with the lemon juice. you will have to drink them seperately as i don't think they mix - only grapefruit juice mixes with the oil.
also i think if your fiance decides to quit the cleanse now, with only taking a dose of Epsom Salts , the worse he will experience will probably be the runs as the salt has a laxative effect.
hopefully some experienced cleansers on this forum will share some light for you.