Heat up wok on high heat until slightly smoking. Add cooking oil to coat the entire surface.
Turn heat down to low.
Pour in egg mixture and scramble until it's 90% cooked. Set aside.
Turn the heat to high, add more cooking oil if needed.
Add shrimp to the wok and saute them in a single layer for 1 to 2 minutes per side or until they just turn pink. Set aside
Add vegetables to the wok and saute until it reaches your desired doneness. Drain any excess water. Set aside.
Add more cooking oil to the wok if needed, make sure it's on high heat.
Add par-cooked noodles to the wok. Let it fry without disturbing it if you like some crispy texture. Once preferred crispiness is achieved, mix noodles up with either tongs or chopsticks so the noodles will not break easily.
Add stir-fry sauce mixture to the wok and mix until the noodles are evenly coated. Pro Tip: add sauce to the side of the wok instead of pouring it onto the noodles, the sauce will be a little toasted which adds depth of flavor to your dish.
Add in the previously cooked ingredients and mix until everything is evenly combined.
Finishing touches (optional) - after the heat is turned off, drizzle toasted sesame oil (1 tsp) on top and/or garnish with chopped scallion/toasted sesame, etc.