
You have chosen the breed most known to hate motherhood. I haven't seen Gwen online for a long time, but she's the expert on your breed. She has often mentioned having to clean poops bums and stimulate urination. Often right up until the time that pups can do it for themselves.
I have to admit, having the tiniest of the toys, that I would hate one of mine to have 8! Resign yourself to being the one to regularly be on bum duty. Regularly being the operative word. They are going to be an eye opener for you after having larger breeds. I'm afraid that you will have to accept this as being part of your bitches' downsides.
While I have always preferred that a bitch does all the feeding (because it's best for pups) I have helped out sometimes if needed. I have always waited until after the pups have been fed by mum though. Only intending to give a 'top up'. I have personally only used Whelpi though so can't give an opinion on anything else.
Don't want to try and tell you how to suck eggs, but a dampened bit of cotton wool to stimulate urinated is helpful. You need to wee wee for them until they have bladder control.
Just to let you know that you will soon look like a zombie and your hair will go grey.