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It not difficult to do yourself if you a familiar with changing brake shoes.

That does not sound that unreasonable. You can always phone HLM for a quote - but they may be far from you - whereabouts are you?

Have a play with this:

http://www.miata.net/garage/tirecalc.html

If you are ME7 (no throttle cable or dizzy cap/leads) then resetting is just hold the trip reset button down turn on ignition till all dash lights are on, wait till service light flashes, then...