Oh geez, this is a tough one. I remember parking my stroller with sleeping baby inside beside the arena and having to climb off my horse atleast 5 times every ride! I just quit riding for the past 4 years or so. Now my kids are kindergarten and grade one I can ride a lot more, however before this time it was just a pain. Like you, I myself have had no family around since they were born, so essentially not a soul to offer assistance. In saying that though, I have been a bit of a mama bear with them when they were so little and vunerable....I am a little more relaxed now and if anyone (I trust) offers to hang out with my kids, Im all over it!!
Don't worry, this time will pass faster than you know!!!