Two people stood one either side of body and pick it up. Starting from behind the chassis raise the front and walk it up over the back of the roll cage and plonk it down into place. Is actually quite easy to do.
Don't bolt it down anywhere apart from the front. If you have the standard front ie not the aircon you will need to weld some brackets to the chassis rail to support the front. When you are ready to attach the body to the brackets you need to lift the front slightly as it will have effectively sagged slightly through the top of the wheel arches.
The back is bolted in place by way of the spare wheel cover.
The only other place it is bolted is along the top of the windscreen but you do this with the rail you get with the soft-top. You may need to put some blocks between the GF and the roll bar to stop the top of the screen opening from bowing.
Will you collect the body or have it delivered? If collecting they will go through all these bits with you and show you the brackets on the demonstrator.