I don't know if I'm just lucky, but I've never had any trouble whatsoever. Make sure the container is properly cleaned and rinsed - soap residue is bad, obviously.
Also be aware that you might get an early bloom on day 3, it won't be ready at this stage, so keep to the normal schedule.
This seems super easy, will definitely give this a go. Haven't had any luck what so ever with starters so far.