In reply to no_more_scotch_eggs:
As noted before if the chimney is tall, or has kinks in it better to get someone in rather than DIY. We got a firm in to rebuild the hearth and fire place, line chimney, fit stove and smoke test.
Thought we were being fleeced, and we would have been, except they couldn't get the liner down past a kink. Next day they had to break into the chimney..........we had agreed 'Fixed fee', at the start which was too expensive, but on the basis of the addition of a make all damage good, and no additional charges I.e they took the risk. Extra day's work, plus Plaster and painter was the at thier expense......
Could easily have been the other way, and them trousering more profit, and us feeling stupid.