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I really rate the Minispares stuff. The biggest myth seems to be this idea that you must soak in hot water, use a hair drier, leave in the sun, bake overnight etc.
Having tried 3 sides worth, realised that the stuff has a tipping point where it melts to the point it loses its memory and I cocked it up every time.

I spoke to Gary at Minispares and he advised to ignore all of this. First put on the rear arch. When it gets to the radius above the radius arms just take 2 small flat bladed screwdrivers and gently lever the back edge of the trim away from the lip about an inch apart, push the trim home and voila your trim is in place! The only caveat is your sill edges cannot be seam welded or have big blobs of weld as this will impede the trim fit.
I have fitted to 4 complete trims since without a hitch.
Hope you find this a succesful route. Cheers. Mark

A small addition :

I find it useful to pop rivet from underneath the ends of the sill seams to stop the trims falling off. If you drill from underneath through the back of the trim to mark the sill, then remove the trim and drill through the sill seam it can be refitted and a small pop rivet fitted without it showing.