I think you may have commented on my previous post about me finding two really hard. I hope I didn't scare you too much.
If not, I have the same gap as you and yes it's tough but it's good to be prepared - I was very naive. Here's some things that have really helped me once dc2 was a bit older (I didn't actually find the newborn stage hard with two as they don't do much!)....
If they aren't already, focus now on making your first a good sleeper. For me, my second followed suit and they both sleep through and nap at the same time which is amazing. We also get our evenings child free from 7pm.
I potty trained my second quickly as two sets of nappies was killing me slowly.
Babyled weaning - both are good eaters, feed themselves, eat pretty much anything I put in front of them and meal times are easy.
The out and about is a great double pushchair.
Do housework and get prepared for the following day the night before. Mornings are a shit show in this household so it makes things easier.
Don't feel bad for putting the eldest infront of the tv whilst you sort out youngest! Or get them to help (mine loved getting nappies, wipes, muslins).
We've never had an issue with jealousy. I'm not sure if dd was too young to notice but we included her in everything to do with ds and showed her a lot of attention. They've bonded amazingly.
If all else fails, chuck them outside with a bowl of warm water and some plastic utensils and you'll get a good 30mins peace.
Good luck!!