When to prune newly planted maple tree

[newbie_landscaper]

I have a newly planted "Autumn Blaze" maple that has multiple leaders coming out from the same point. Based on all I have read, this is not good.
I just had it planted (for good $$$) and the tree farm owner assured me that they picked out one of their better trees for me. I asked directly about the multiple leaders and he dismissed it as not an issue of concern. Not sure of the age, but it was in a 45gal container and has a 3" trunk
I have 2 questions:
1) since this was just planted, it is safe to prune the excess leaders now? Or must I wait?
2) is this just to be expected from maple trees or was the guy blowing smoke for the sale?
Thanks for the input and advice!

Pic of the tree: http://image63.webshots.com/763/6/79...8DAirap_fs.jpg

[backyardgardener]

Your photo link doesn't seem to work.

Backyard

[newbie_landscaper]

Trying the link again...
MapleTree 007 pictures from home photos on webshots

[Newt]

Hi Newbie,

I don't know if you got help with this yet, but I would suggest you have a certified arborist do the initial pruning for you and observe closely where and how they make the cuts. I also see several branches that appear to be growing into the center of the crown. Not more then 15% of live branches should be pruned each year. The best time to prune a maple is May and June.
http://www.pubs.ext.vt.edu/430/430-460/430-460.html

Newt