With the integrated fridge it was simple as there were just screws and brackets that needed to be unscrewed however on the freezer I have what looks like 4 slotted brackets with bolts (2 either side)?

I think I probably need to get them undone using a flat pressed type spanner like you get with bikes etc though I don't know quite what size it would need to be?
Also I have the issue that I can't get to the two brackets on one side as it's close to the wall, would I be right in thinking I'll need to take the door of the freezer right off?