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Jung
I used to strip and rebuild my TZR250 by flashlight overnight then off to work the next morning. 2 strokes, you've got to love 'em. Always have a spare barrel and matching piston to hand, or 2 if it's a twin. You shouldn't be shy of whipping the head off anyway, just tighten the bolts diagonally opposite each other when you put it back on, if you've not got a torque wrench just be sensible and use a 6-10inch ratchet. Most 2 strokes you'll get away without a tool for the rings. If you take the piston off, you'll probably want a new gudgeon pin circlips though.