Where in RLP? I have vacation at the end of April. But only if I can expect something in return when I do my garden soon.
400 sqm is indeed a bit of work, but from my experience, rough turning of the soil helps much better against weeds than shredding and aerating the soil with those rotary shredders. They are advertised like butter as if they are essential, but contain the weed devil, just like butter contains (too much) fat.