What is the average cost

Going to have my clutch replaced soon and I am wondering what the normal price from mechanics is? I already have the parts and will be just paying for there labor but would be handy knowing what other have payed to make sure I don't get ripped off.

Also I am sure I have a leaking injector. Better to have them serviced or replace them?

good idea to replace the rear main seal of the engine while the gearbox is out, but will involve the flywheel being removed too.

U serious lowMicra? only $150? Lets break it up...average person with proper tools and lift about in a workshop:

Labour removing and reinstalling gearbox, plus adjustment approx 3hrs
optional = removing flywheels, machining it, changing rear engine seal another 1 hr
Then plus parts cost ie, clutch kit, oils, etc...

So i dont know how ur actually making a living on $150 clutch change? Even assuming the customers supply all the parts including oil. Most shop would charged $70-$80 per hr average that would be approx $250 at minimum.
If i was a shop owner i wouldnt Even touch it for $250 as you have to factor in the fact that if something fucked up not anything due to your fault ie, faulty parts supply by the customer etc. then it would be over my head pulling it apart and redoing it as i would have a reputation to keep. Therefore most if not all workshop would prefer to supply and fit the part themself.
I would assume an average cost of $400-$500 to be reasonable for a clutch change. Thats just my opinion.

300-350 is what I've paid in the past.

Then I just did it myself..

had my nismo super coppermix clutch put into my s15 including Nismo gearbox mounts at the Nissan dealership for 300, that is a much much bigger job than a little micra clutch.
have you seen a micra clutch?.....it's so tiny it's a joke, i couldn't believe that was my clutch haha