I've just ordered some sheet film to run through my sorely under-used MPP and realise I'm very rusty on the development side of large format. Last time I used it, about fifteen years ago I had access to a lab - now I have only the bathroom and some trays. Can anyone advise on tray development? Is film scratching a problem? How many sheets can I put it at one time? How much developer is needed, what sort of agitation and how do I know when it's exhausted? Any tips on drying sheet film? All advice gratefully received.