Step 3, switch to a view where you can see the front(back in the picture) and side. Using the control key to keep the section round, and working in the front view while watching the side view, drag the section's corner size to match the guide.
Step 4, I kept the tip disk small and nearly flat because triangles do not subdivide like quads and if this disk is large and cone shaped the algorithm will introduce some jagged edges.
Step 5, turn the subdivisions back on and admire your handy-work.
Ron