Uh.. you just, um. Well. I have no clue and muddle by. I have no family (or friend) support and this is my third SPD-plagued pregnancy with a toddler of a very similar age (my age gaps are 26, 29 and will be 35 months) and it's really kicked in big time again this past month.
Survival mode. Every day you get through is a victory.
Tactics I use:
Bribes to get them in the pushchair, or at least incentives of some kind.
Thick skin at ignoring judgey people when I can't just "pick them up" when out in public. I'm using a Little Life backpack for DS at times, and although it is sore, I can drag him to vertical with it (not that his legs will do anything other than jelly most times!) if needs be. I'm sure some people are appalled. They could offer to help
especially as I sometimes have a crutch in the other hand, but no.. they'd rather just tut.
Asking strangers for help (have never done this, am too shy, but I know some people are able to)
Stairgates everywhere, better babyproofing so that I can leave them in a room whilst I cook, visit the bathroom etc without them coming with me.
Being prepared to let them cry more often. Lowering standards (okay, so they all jump on the sofa and the table now..)
Send them to full day nursery more often (expensive, but a lifesaver)
Beg DH to work from home more often (poor DH's career)
With my pregnancies with this one and DC3, I get poor DC1 (now 7) to help out a little.
Moan about it to people
I'm an expert at that now!!
There is no solution, certainly not anything that works out perfectly for everyone. It's for a short time, previous standards just have to slip and finances have to be stretched and careers dented..