Hi Nichola, I levelled my front garden last year and put in tiered retaining walls, dug it all by hand over a couple of months and extracted what felt like a million tonnes of rubble, so I feel your pain. Managed to re-use a lot of the rubble though, so its worth putting it to one side when you dig it out. I have the sloping back grass to level this year, and according to the neighbours, the back gardens are mostly rubble and clay too...oh joy! Everything is do-able, you just need to have the right attitude and it sounds like you have You might not have a lawn sown this year, but you will get there in the end
I think it might be wise to do a bit of this at a time - 150sq m is quite a lot of rubble. Perhaps try to do the third of the plot nearest the house/in the sun or the least challenging bit. It will give you a sense of achievement.
P.S We had NO money at the time we did it and had to do everything ourselves, we even advertised the rubble as hardcore on freegle and people came and took it away!!!
Just a couple of small points from a less than expert gardener - I read in one of Monty Don's articles. (Saturday Mail Weekend supplement) that he advises not killing ants as they do no harm (unless coming into the house and being a nuisance.)
Also, be careful encouraging foxes - one killed a Yorkie here in the Bournemouth area a while ago, also someone's cat.
Lastly, If you are a bit short on funds do try Freecycle. I have disposed of loads of things and also acquired some very useful items (yesterday I collected 20 small bags of topsoil to fill up my shallow borders and a virtually new highchair for my daughter's baby!) I will be advertising my small areas of grass - for turf - as I will be gravelling/paving. Lots of paving seen on Freecycle too! You can request items but usually only one item per fortnight - depending on the rules in your area.
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Hi Nichola, I levelled my front garden last year and put in tiered retaining walls, dug it all by hand over a couple of months and extracted what felt like a million tonnes of rubble, so I feel your pain. Managed to re-use a lot of the rubble though, so its worth putting it to one side when you dig it out. I have the sloping back grass to level this year, and according to the neighbours, the back gardens are mostly rubble and clay too...oh joy! Everything is do-able, you just need to have the right attitude and it sounds like you have
You might not have a lawn sown this year, but you will get there in the end 
I think it might be wise to do a bit of this at a time - 150sq m is quite a lot of rubble. Perhaps try to do the third of the plot nearest the house/in the sun or the least challenging bit. It will give you a sense of achievement.
You just have to think of it as a job that's going to take you a few years and do a bit at a time.
It seems like a massive job but you'll get there. It's important to just be patient and visulise the end result.
Lou12, if I'd known that last year would have saved myself the price of a skip....
Thank you everyone, I've taken some photos only have to find the cable to upload them onto the pc.
Just a couple of small points from a less than expert gardener - I read in one of Monty Don's articles. (Saturday Mail Weekend supplement) that he advises not killing ants as they do no harm (unless coming into the house and being a nuisance.)
Also, be careful encouraging foxes - one killed a Yorkie here in the Bournemouth area a while ago, also someone's cat.
Lastly, If you are a bit short on funds do try Freecycle. I have disposed of loads of things and also acquired some very useful items (yesterday I collected 20 small bags of topsoil to fill up my shallow borders and a virtually new highchair for my daughter's baby!) I will be advertising my small areas of grass - for turf - as I will be gravelling/paving. Lots of paving seen on Freecycle too! You can request items but usually only one item per fortnight - depending on the rules in your area.