Here it is on a TN squirrel rifle.
The cutting stage on the above rifle;
Start by marking the midpoint on your barrel side flat. I draw a line from stem to stern with a sharpie on both sides and carefully lower the wood alongside the barrel to my line. after you get the wood to half a flat you are ready to make the sloping transition along the tang to your forestock wood.
I use a sanding block to lower the wood alongside the barrel as well as thin the wood where it meets the barrel.
I prevent slab sidedness by checking with a contour gage.
I am also a rank beginner so others are bound to have a better way of doing things than I do.