I'm part-time primary in a 2-form entry which is new to me, up until September I was in a single form entry and I found it so much easier!! I also trained in Secondary and had so much more time to prepare it felt like, it was much less of a workload than primary, but the attitudes of the children is what made it harder for me!
Anyway....be careful with your time and crack on as soon as children are out of the room. Plan lightly and not in tons of depth - inevitably jobshare will have their own take on how something should be delivered so don't overplan for them, keep it brief and they'll pad it out to suit their style. Use twinkl if it helps but don't rely on it so heavily as worksheets are quite closed opportunities - good for homework perhaps. Live marking as you go in lessons, have purple pens out in the tables and get children to respond at the time too, get them to mark each others.
BE decisive with your planning, don't digress and come back to it later - once you've started it, focus and finish it and decide not to revisit it or redo it.
Remember to focus on what the skill is you are teaching and less on the fripperies or niceties or things that would be nice to do.
Prioritise and stick to it. I tell myself I'll spend 20m max responding to emails for example, then 45m doing something else.
If you work through lunch, make sure you do actually take at least 15m break.
Good enough is perfect for me.
I do feel like working as a jobshare is so much harder than full time, you feel even more like you have to prove the jobshare is working, even if it is.