Rt. If you have access to a full size plan, you can make a very good profile pattern from it. Here's what I do. I use a piece of 1/8" masonite and temporarily tape my pattern to it. once stable, take an awl and prick holes into the masonite through the plans as close together as needed so you can connect the dots. Remove the plans and connect all the pin pricks. Once done, cut out the profile as close to the line as possible with cutting into it. Next, wrap a small block of wood in sand paper and smooth out the cut edge to the line. You now have an accurate profile pattern. You can now position the pattern on your blank for best grain orientation and such. Once done, you have a cut line for your profile. The beauty of this is that you now have a pattern for future use. You can also write dimensions on the pattern where they matter.
Having taught a Kentucky Rifle Building class for 10+ yrs. at the local tech school, the hardest part is getting started. Just jump in and do it! There's a whole lot of knowledge and skill at your disposal on the forum. If you have ability to post photos, post them and ask away. If not, post any ways, members are always helpful.
Dave