i think either paysomeonea few bob to do it or cut or burn them to the floor . then get an old bread knife and saw threw a piece you think you can manage . an oldaxe mite help to . the other option is to offer them to someone who wants them and put buyer digs them up perhaps .

you could poison them but grasses are very hardy and you wont beable to plant anything else in there for a while .

I hope you're doing it with a proper garden fork, not a border fork or something smaller, and that you don't live in the south or somewhere still in drought. If the ground is dry and hard, soak it well by leaving the hose running around the grasses, or using a sprinkler for a good 2 hours or more overnight. Then just go round the outside of each clump with your (full sized) garden fork, levering the soil as you go (preferably without breaking the shaft of your fork), working inwards and under the clump as you go. If they don't start shifting then, you'll need a spade - excavate around the edges so you can see where the main root clumps are, then go back into what is now a trench and use the fork again, going inwards and under and levering. They'll come out with this method.

you can cut it into more managable pieces with said bread knife and then leaver each piece out .

If you can't manage it using Bamboo's method you'll need to pay someone to do it for you. Do you have any neighbours with good strong teenagers who you could supervise to do it? It's not the sort of job you need a whole lot of qualifications for.

just what i thaught beattie . someone will do it for £20 in there pocket especialy if there teens .