6 x 8 is your standard small greenhouse. If it's been up for a while, then a lot of the little bolts will shear when you dismantle it, but Wilko's used to sell bags of them, and spare glass clips, too ( or B&Q ). The bolts are aluminium so as to avoid electrolytic corrosion, but that means they are fairly weak and prone to seizing..
Take lots of pictures before and during the dismantling phase to avoid embarrassing difficulties later, if the instructions aren't available.