Dell XPS 15 9550 FHD 1TB SSD upgrade?

Hi guys,

I've been looking at the Dell XPS 15 9550, and I'm trying to figure out if it's possible to upgrade the storage that comes with a FHD (the one i'm looking at comes with a 1TB Hard Drive) into 1TB SSD. Has anyone tried it, and/or is it possible to replace the hard drive with a 1TB solid state drive?

Side note: I'm trying to get the FHD because I don't want to pay extra for a 4K display (something I don't want).