Quick lesson in child psychology.
Kids say what they think their parental audience at that time wants to hear. If they feel like mum will embrace their excitement and be upset with their disappointment, they're going to be excited.
This is why the Court doesn't put any weight in comments made by the kids to the parents. An affidavit is a statement of fact, but as far as kids' opinions go, the only factual component a parent can provide is that the child said something to them. It's not necessarily fact that what they said is true.
As such, the Court only accepts evidence of the kids' views if they are shared with an objective third party professional who can serve as an expert witness. Kids are more likely to speak candidly with someone in whom they have no personal investment.
Thus, just because the kids tell mum they're excited, doesn't mean they're excited. You might find the kids would prefer to stay where their friends and school are.
Now, the conference, from what you've described, sounds like a dispute resolution conference. Generally speaking, you should be more intimidated by the Court than by a conference. A conference is overseen by a neutral third party, and their only role is to keep both parties civil and focused on resolving the issue at hand. They don't tell the parties what to do and they don't tell the parties if they think they're being a bit daft in negotiations.
This is why it is a good idea to take a lawyer who represents your best interests. I'm not sure what the cost will be, but its easy to get an estimate from a few around.
Now, this is personal experience from dispute resolution.
At the first conference my husband attended with his ex, he signed a parenting plan that he didn't agree with. It reduced what his time with his daughter was for the preceding two years from alternate weekends and one overnight each week to just alternate weekends, which meant an 11-day gap between when his then 3-year-old daughter would see him. His lawyer, who was funded, said it was better to have something in place than nothing at all, and it would deter the ex from withholding the child again, so he signed.
A month later, he filed for parenting orders looking to return to the previous arrangements, and a month after that, the Court made the parenting plan into interim orders for the duration of proceedings. The care arrangements that had been in place and had worked well for two years were done away with and replaced with care arrangements that had been in place for two months and were causing all kinds of problems for the child, all because he signed that stupid parenting plan.
Parties were ordered back to a conference after completing a post separation parenting course, the ex still refused to budge on time spent with, but wanted a bunch of other new demands considered. At the end, my husband left with a proposal, but what he didn't do was sign it. He took it away "for consideration", then chucked it straight in the bin. He learned once before not to sign a document he didn't agree with, he wasn't going to make the same mistake again, and he wasn't even represented in the second conference.
After ten months in proceedings, he ended up with equal time.
So, moral of the story is: don't sign anything if you don't agree wholeheartedly with everything that's in there, and don't be afraid to refuse to sign anything on the day. If you think you're going to get a better deal in Court, don't sign, and don't just do what your lawyer tells you to. Think about it all carefully.
My only other advice is to go in with a list of issues that need to be discussed, a list of outcomes you prefer, a list of alternative outcomes that could be considered, a list of outcomes you won't compromise on, and a list of reasons for each in terms of children's best interests. It will give you something to refer to.
Anyway, hope this helps.