Here I go with another round of questions

How do I know when to call my birth support person when I go into labour? It's not like she's just around the corner & can pop over and go home if I'm actually not in labour or not progressing anywhere (she'd have to fly here, so however long to get to the airport, fly to Sydney, then get the hours drive to here, so maybe 3hrs all up). Would I know when I'm in labour? I suppose last time labour started at 1pm and I went to the hospital at 1am so I would know I guess.

What about having her at home? Would it be best to get her here before I feel ready to go to the hospital or get her to arrive to go to the hospital with me?