I'm a bit further down the line, DD1 is 10 and 22 Months behind her is DD2 at 8. (Plus DD3 just 4!)
One thing I remember from the early days was trying to make a conscious effort to spend time with DD1. Sounds so simple in theory but harder in reality. We didn't want eldest to resent the new baby because it meant she got the rough end of the stick. So even if it's just 20 mins one on one at bedtime or similar, just give that reassurance they are just as loved as before.
DD2 'grew up' quicker because she idolised her big sister. So where DD1 was 2 1/2 before dry in the day, DD2 was bang on 2, simply because she had an example to follow.
Forward to now, one thing I'm really bad as is forgetting that there IS 2 year between them. I tend to expect similar things etc from the 8 year old as the 10. So behaviour and understanding does differ slightly and I'm guilty of expecting 8 to be the same as 10 if that makes sense.
Now we have DD3, again I'm sorry to say I'm bad in that DD2 does get 'middle child syndrome' at times. DD3 has chronic eczema which takes a lot of care, due to that we have only recently cracked potty training. (Didn't want any extra pressures on her). With DD1 just started middle school she has new challenges, friendship issues and general hormones! As a result DD2 tends to simply plod along and then will either blow up with all her stuff, or behave so appallingly just to get some attention.
I think what I'm trying to waffle about is to go easy on yourself. You will make the odd blooper, you will have hard days but it does come good. It will be new balls in the air and you may well drop some once in a while. Remember that while they are learning how to be themselves, you are also learning every day about being an adult and parent.
Good luck!!