Get yourself a CombiPlan tank. This is a daylight tank (load in the dark and process in the light). The system consists of a hanger (plastic) which will take up to 6 sheets of 5x4 film. The film is easy to load onto this rack and a clip holds the sheet in place. The hanger/rack then sits inside a plastic box which has a snap on lid complete with a light proof valve. Chemistry is poured through this valve (via a funnel which is supplied) and the tank is agitated as you would a 35mm/120 tank, BUT slower (almost slow motion!!. This is important as the sheets of film can spring free from the rack if the tank is too vigorously agitated. Chemistry is emptied via a light-tight valve at the base of the tank. It is a bit quirky to use, slow agitation, slow filling time etc, but once gotten used to it is a very easy method to use. The tank takes just over 1000ml of chemistry for 5x4 film.