Hi Suziemo, first of all welcome to this forum and to the world of Exante.
Right, the worst thing is probably going to be hunger pangs for the 1st few days, the next will be the cravings for food when ever you smell or see it, if you can get past both of those you will fine. Next will be the horrible taste in your mouth, remember you are not putting food in so you taste buds are not really being stimulated. Next will be the bad breath once you go into Ketosis, if you do not know what ketosis is check the forum, the are a few topics about it or just google it.
You might get light headed, feel sick or get a headache for the 1st few days, the most important thing to remember is, DRINK BETWEEN 2 AND 4 LITRES A DAY. You must keep drinking fluids or you will feel even worse.
Right after all that negativaty, the positives far out weigh the negatives, you will lose weight quickly and healthily, your measurements will drop quickly and that is the point of the exersise.
If you want you should join our forum, introduce yourself and you will be welcomed with open arms. This forum is full of people who are both inspirational and motivational and will try to get you through the bad days and will be there to share in the good days. Oh and 1 other thing, you are not a scaleoholic are you?