Hi op I have 2dc. Dd will be 8 in February, ds's birthday is 16 days later and he will be 16. So our gap was 16 days shy of 8 years.
I will be honest, it was easy to start, got a bit harder in the middle and now is getting easier again.
With an 8 year gap it's like being a new parent all over again, "rules" had changed ie when I had ds I could make up multiple bottles at once but when i had dd it was make them up as needed.
I was very lucky that both of my dc slept from the minute we got home from the hospital and I wasn't expecting dd to be the same as ds as I'm aware it's not usual.
That helped massively. As did the fact that ds was at school so I had all day to play with dd and took her to loads of baby groups etc.
The middle years were tough i.e. Dd being 3 and ds being 11. Family days out, where do you go to suit both ages? They both love swimming so that's always been something we've done together.
Ds was desperate for a sibling and really wanted a sister. When she arrived he was jealous for about 2 weeks and he struggled with the change in dynamics.
Now they're both older and there are still some issues/challenges but on the whole it's lovely.
I know ds will look out for dd when she's growing up and they get on really well.
I have 2 brothers. I'm the eldest and there is just 18 months between me and my first brother. My youngest brother arrived when I was 8 and the age gap seemed huge as a child. Now I'm 40 and my brothers are 39 and 32 it's nothing at all.
Good luck and I hope it all works out for you 