only one other suggestion to add - one of mine was very sleepy, I used a cool wet cloth to wake him if he fell asleep and stopped sucking, also I found that once they had finished one side they often weren't too enthusiastic about the other side, so changing their nappy between sides woke them up a bit too - that helped them to keep going!

Good luck and don't despair yet - it is very early days, you will find that things get easier soon!

Jo