All nicely said. I too in 1990 wanted so badly a sector watch but could not afford it then. I look at them now and I am glad I didn't have the money then. It would have been a waste. I was only 16.
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If you haven't done so already, you will need to buy some watch tools. Read up on tutorials here on how to remove your movement from case and subsequently rice the dirt. Dirt and dust will always appear and it would be costly to keep sending to watchsmith to remove.
I had to learn how to do this and now if I see anything under the crystal , it takes less than 10mins to remove and clean.
Good luck