playpen - definately! We used it for DD2 to sleep in without being mauled by DD1!
I too had 15mnth age gap. It is hard, but so rewarding! I will admitt to perhaps using Cbeebies a little more than I would have liked, and agree with whoever mentioned ALWAYS having a change bag ready to go with both size nappies, wipes, change of clothes and bibs and juice cup (and bottle if FF)
We always had breakfast at the same time, same with lunch and dinner, and a rule of children in bed by 6.30pm.
It meant I often didnt eat during the day (could have but was so tired and stressed couldnt be bothered!)and DH would make me a decent meal in the evening.
Was also tucked up in bed by 10pm myself every night.
Search out a toddler group - it is perfect for being able to pass a new baby around and also to get 10mins to spend with DC1 on a 121 basis.
Without my toddler group which ran monday,wednesday and friday I would have gone fruit de loop!!! It took up the morning so the children would sleep after lunch and I got time to run the hoover round/tidy up and then sit and enjoy the silence!!!
You will enjoy it, I then had a 25mnth gap between DD2 and DS and to be honest, that was sooooo much harder! Would have preffered to have them a lot closer together, but hindsight is a wonderful thing!
CONGRATULATIONS!!!!