Phil, stop spending money to start with. Congrats on getting 60i certficate. Now trust me when I say this and as Sammy has said, don't do anything stupid for the sake of a few hours visit...
I, too, am looking down the barrel of a lonely Christmas as our next court case "interim" is at the end of Feb. And believe me, she as would be your ex is just itching for us blokes to do something stupid in the mean time.
Don't do it.
Right, next is course of action...fill out the Initiating Application ( family law ). It's on the family law courts website. Attach your affidavit, all of your supporting annexures, a notice of risk, your parenting plan. This is what you should be spending all of your waking hours on at the moment. This paperwork. Then submit it all online after you've been to a JP.
Next Sammy gave me great advice...Get the book "Breaking Up" read it cover to cover, while waiting for your court date.
Its seriously hard work to dial down the testosterone when it comes to your kids...when you want to walk on in and scoop them up and say they're coming with me. But unfortunately, this is frowned upon. If you're getting crazy urges...jump on here, vent it out or call one of the help lines...I hit rock bottom a few weeks ago...I turned up at my local gp and was able to see him straight away...best thing I ever did.