1. don't strip any screws... (removing the screws is not getting to the job... it
is the job)...
...so, concentrate on getting each screw out cleanly, without stripping it, loosing it, or damaging the threads...
2. give yourself room... clear a dining table size area, so that when that tiny part runs off,.. you can find it...
3. There's a brass washer under the main jet,.. don't forget it...
4. If you can't get the main jet to thread back in... the jet needle tube has slipped upward in the shaft... put your finger into the intake inlet and push it back down...
5. replace the float bowl and top cover screws with allen heads... (makes it easier next time)...
That's all I can think of... off hand...
Good luck,... don't rush...
...