Hmm not sure about "nailing it" but I've survived almost 31 years so my top tips:
Find ways to meet SEND needs that can just become part of the day for everybody so that it doesn't feel like an extra job. EG. Library of social stories in your class, visual timetables that the kids prepare, costly corner or (if SLT allow it) couch with loads of cushions in your classroom, sensory break materials (Pilates bands?) in a box in class, using a range of signs (Makaton?) as part of your daily routine etc.
Go minimalist on the weekly planning, only plan as much as is actually helpful to you and don't let them tell you that you have to hand it in.
Set clear boundaries about how much you will do at home and stick to it so you have some leisure time.
Build in twice daily calming and feelings check ins to your routine, they really do help with having a class feel more manageable.
Plan practical activities for Mondays wherever possible , it makes a gentle start for the children and means you're not rushing in on Monday morning to get in line for the photocopier.
Don't be afraid to be the person who asks if the work load impact has been assessed when they're wheeling out their latest shiny new scheme, intervention, approach...
Have monitors in school and basically train your class to do as much as possible for themselves. Hard in the first term but pays dividends after that. Plus it's great for the children.
Get it into your head that pretty much everybody feels like they're bumbling along and just about making it through, they're not all doing it much better than you!
Finally, if you find something that promises you a slightly easier life with no detriment to the children EG pre prepared lesson plans that you find on line. Then grab it with both hands.