Taking the carb apart is scary the first time, but really is pretty easy. A few tips:
1. Have a clean place to work and lay out the parts
2. Don't strip the screws. Use a #2 JIS screwdriver, or file the tip of a #2 Phillips head until it seats well in the screws.
3. Be gentle with the diaphragm/slide if it is stuck
4. Take photos as you go so you remember which way it goes back together
5. The little plate in the bottom of the slider goes dimple side down (it can be hard to tell from photos)
6. Don't have left over parts when you're finished
7. Wear gloves and clean everything thoroughly before reassembly, especially the needle and slider.
8. If you spray carb cleaner into a hole, it should come out somewhere else. There are no dead-ends.
9. Where eye protection when spraying carb cleaner into the carb. It WILL kick back.
10. If you have a partner who likes to keep your workspace tidy, tell them not to 'tidy up' your carefully laid out parts
11, And ... the idle mix screw on the side of the carb covers a spring, a tiny washer, and a tiny o-ring which seem to be designed/assembled for the specific purpose of losing one of them!
12. Also, record your jet sizes and needle spacer settings. They'll be handy for later tuning.