Jedsdead wrote: ... drilling of the mixture screws seems a little out of my league....
Here's a video about removing the EPA metal cap that blocks access to the pilot adjuster screw.
The carb pilot adjustment screw may be located on the side, or bottom, or on top of the carb.
The pilot screw on the carbs shown in this video are located on the bottom side of the carb.
Regardless of the location, the removal technique is the same.
Side-located and top-located caps may be removed without removing the carbs from the engine.
But with bottom-located caps -- such as in the video -- the carbs must be removed to access the caps for drilling and removal.
Some aftermarket carb kits include a drill bit and a screw with instructions about removing the EPA mandated caps. It's a "sheet metal" screw, which is better in this application than the "wood" screw used in the video.
May fit a plastic tube over the drill bit allowing a small portion uncovered at the point of the bit to gauge depth of the hole being drilled.
Could also wrap a piece of masking tape around the drill bit to mark the correct depth, but the plastic tube is more fool-proof.
When gripping the inserted metal screw with pliers, it's okay to tap the pliers
from underneath with a hammer to pull out the cap.
This is but one of several available YouTube videos, and might be the worst one of all.
Good Fortune!