I am not sure on the difficulty level, but you should access the dial/movement from the front (the 4 silver bezel screws in the corners). Also, if you want new bezel screws, a seller on eBay called JaysandKays may have ones that are close (and I think they have strap screws/bars as well) - they may be worth checking with to see their stock and possible compatibility. The screw in the back of the case is for the crown stem release I think.