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@mashton
Jan,
I think what Pete is trying to say is that it is unusual to have to use a chain tool to remove your wheel. If you slacken the track nuts off and move the wheel in the dropouts until the chain is slack you will be able to remove the chain from the chain ring.
If this is tricky then CAREFULLY use your finger as a derailleur to shift the chain off the chainring teeth as you rotate your cranks. This pulls the chain round and off the ring. Hey presto.
Be careful, doing this. If you don't know why, google for Sheldon Brown and fingers.
Anyway, the above advice is probab ly a bit too late for you at the moment. It sounds as if your chain has not been put back together correctly or, more likely, you have set your chain tension too tight so that drivetrain is grinding. If the bac is on it's back and you rotate the cranks, does it all roll around smoothly and come to a nice gradual halt? Does it run silently (ish) like this.
If it slows quickly and makes a noise then you just need to set the chain tension a bit looser.
I won't explain how to do this here - again google Sheldon Brown and chain tension.
Sorry if this is all egg-sucking advice - I am assuming that you are new to all of this?