He shouldn't expect anything. The mental aspect of withdrawal is one of the worst parts, and the anticipation of bad withrawals makes it worse. Everybody is different, so there is no use in them hyping it up in their mind. Telling them to expect 3 shitty days of withdrawal doesn't really help them much.
Now that doesn't mean that they shouldn't prepare for withdrawals. Also, does he mean 1 or 2 bags, or .1-.2? We discussed the actual size of bags recently, so if it is the former it really shouldn't be bad, and if it's the latter it shouldn't be much worse. Tell him to get some loperamide to help, but that's all that I would take in the opiate department. Other than that I would tell him to get something to help with sleep.