DON'T
go at the digging like a bull at a gate and get dispondent.
Dig over a small section by small section carefully removing weed roots, luckily the nasty ones have roots that show up white - couch/twitch grass and bindweed.
Pack up when you want to, don't feel you have to get a certain amount done.
Relax after your toil, sit back with a cup of tea / G&T , read a good book on allotment gardening, decide what you want to grow, set out a plan (but be ready to change it) plan and dream of fresh veggies to come.
Become a scrounger, old pallets & doors make a good compost heap. and with a thought of a shed...... Coffee cups from the machines with a hole cut in the bottom, are great for starting off seeds.
At this time of year see the council and ask for a load of leaves, I believe they have to pay to dump them in land fill! ! ! My very best wishes and Cheers, Tony.