super common on the civics for that bush to be torn. yeah it will be messing your wheel alignment a little but its not death defying and the arm wont fall out or anything. Main cost in replacement is the labour, you would really struggle without a hoist. It used to call for the whole rear trailing arm and brake assembly to be removed so the bush can be pressed out and new one in...however, you can hit the old bush out and the last 2 ones ive done with bushes from nolathane and pedders now have a tapered end on them so you can hit the new bush in.....way quicker than removing the arm.