You will do fine! You are already a mother of 2 so you know a lot and so theoretically you are ok!!! =) It will be tough...but take one day at a time. I have a toddler (under 3) and 10 mo twins. I must confess i was a bit frustrated the first 6 months cos it was REALLY HARD to go out without another adult so i was stuck at home a lot....But things get easier after 6 months. I have a twin pram (the baby jogger double mini) and it's AWESOME. I also got a buggy board for my 3 yo so i can get from A to B with min fuss. Hopefully your eldest will be able to just hold onto the side of the pram. It is possible but it is tough...but you will be fine...=)....Good luck with everything!!