Is this place near you a retail store or an importer? I don't want to know the name of the place(it is not a good idea to say bad things about people on forums

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If it is a retail store acclimation should be real easy. If it is an importer and they are FRESH wc, it could be much more difficult. In the past when I've bought different types of reptiles I found one particular importer was terrible. They had animals in VERY poor health. I've seen others where the animals were always robust too. If this place is an importer I would recommend asking them what all is involved in their acclimation process. It could be some dewormers or maybe just a few feedings to see how the animals are doing.
If you find out that some sort of medicine is being given as part of the acclimation you should probably wait to get the geckos.
If you get the geckos, just make sure you have the enclosures set up and heated properly before buying the geckos. Also, I would order yourself some Repashy Day Gecko MRP. Phelsuma love this stuff! I use bottle caps and velcro to feed it. I put the lid kindof close to the heat source, but not right under it. Keeping it up off the floor will increase the interest in it. Also, since they are new geckos, for the first few weeks I would personally feed them daily until you are sure that they are eating and seem healthy. I feed my geckos crickets usually 2 times a week, sometimes 3, and Repashy 2 times a week.
Don't hover over the enclosure for the first few weeks too. They tend to be shy at first. I try to sit back and watch sometimes to see how they act. If you hover over the enclosure it could keep them from wanting to eat
Gold Dusts are very easy to keep!