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These birds should get along fine. According to Henderson's Breed Chart (google henderson's breed chart,a good resource) the Wyandottes are usually docile but can be aggressive. But any individual of any breed can be aggressive. And there will be a pecking order in the flock no matter what breed you get. It will be a pretty flock.
As far as cancelling the order, you have risks no matter what you do. There was a thread on here yesterday, maybe one you saw, where someone got chicks locally and many died. They were from a hatchery which most local chicks in feed stores are.
You could probably find individuals in your area that would sell you chicks, but it is highly unlikely you'll get the breeds you want from one person. If you go to more than one individual, you have the risk of getting a diseased chick in your flock. And if you get different aged chicks, you can't keep them in the same brooder. The older ones would pick on the younger, maybe killing them. Or you can go to a swap meet in your area and get grown chickens. You still have the risk of bringing a diseased chicken home. People do it successfully all the time, but I'm just saying there is a risk.
You are ordering in mid-March. It is not a bad time to order, but the weather is unpredictable. If you get a freakish condition, like our recent ice storm, your risks go up. But they are called freakish conditions becasue they are unusual. I don't know of any postal holidays then, so that reduces a risk. My brother, who works for the post office, said they were undergoing mail count (how many parcels are delivered so they can adjust routes). I don't know if that disrupted service or not.
I'm not going to say not to worry. I'll worry when mine ship. I'm not going to say everything will be fine. You'll probably have some difficulties and disappointments raising these chicks. But if you lay in bed all day to avoid an accident you risk getting bedsores. I'd suggest taking the risk. The potential joy you'll get out of it is worth it.