not done these, bushes should be about £50 for the pair, and removing dead axle is simple enough if you have some experience, the old bushes will need to pressed out, the housings cleaned and the new one's pressed into place if you don't have access to a workshop you will be struggling. or try a low mileage second hand axle which should include the rear brakes, then its a case of installing it to the chassis. the choice is yours.