Anybody have experience installing large spruce, fir, etc? when I say large, I'm talking 18-25' in height. What are the special considerations for planting? Can they be installed into a dug hole like a smaller tree/shrub or should they be installed with a spade? They will obviously be difficult to handle, even with large equipment. I can't say as I'm really sure how to charge for something like this either. Any help would be appreciated.