The hoses attach to the filter a bit like the 'Hozelock' fittings on a garden hose - pull the clips back along the line of the hose while holding the filter. If you wrap some rags around the joint to collect the spillage (there will be some owing to the residual fuel pressure, but it shouldn't be too much) and make sure you haven't got a fag on the go, then all should be OK.
