Hi, I've got an 8 month old too who has trouble sleeping. Wake ups can be every 3 hours, but we've had one 6 hour one (heaven), and the odd 5 hour...
I really feel your pain and struggle with the inconsistent wake ups.
My DD was in our bed until 5.5 months waking hourly and I was about to throw myself off a bridge. It is of course your choice but sleep training saved us. It was hard but she at least now goes in her own bed and sleeps a bit longer than hourly.
I know you don't want to wake up the house but it might only take a few days so could your DH take a day or two off at the weekend so you can do it then, maybe send your other DCs to a relative for the weekend?
It is totally your choice though as sleep training isn't for everyone. You know your family best.
But just bear in mind the airplane parenting example. When the air masks hang down on a plane, you are told to put the mask on you before your child, because if you pass out before you put the mask on the child you both die... to be the best mummy you need to make sure you are as ok as you can be.
That said, 8 months can be tricky to sleep train as lots of development stuff going on and the start of separation anxiety... I'm sorry there's no magical answer, we're all just muddling through with these tricky sleepers but don't feel like you are on your own. You're doing a great job.