to cut a long story short my big bumper has been part ripped off

i'm struggling to get to the 4 screws that hold it on to the metal support bar, is there an easy way to do this or should i buy a packet of plasters & a bottle of JD to ease the pain

she's an 88 with genuine dub bb's. also noticed that the bumper sits about an inche to low on the double wing brackets, i'm confused by this as the bracket top hole is orig & the lower has been drilled for the conversion???