Yep, the Lyman is a nice kit with some very non-authentic sights. They are basically inletted for all components and require only stock sanding and finishing, as well as doing something with the metal.
For a more authentic look, re-do the front sight to be very tiny, discard the goofy rear and replace it with a more original style, available from many sources like Dixie or Track-of-the-Wolf.
If you are a gifted "5" on a 1-10 scale, you should have no problem with this
Only someone under the age of 18 could see these tiny sights. Older shooters must have had incredible eyesight to accomodate the tiny sights as well as the target ... or maybe missed alot.
In my opinion, the Lyman lock with coil springs is slow. It can be replaced with an RPL lock with flat springs from the L&R Lock Co, although there is some minor wood removal needed in the lock recess.
That pistol is a great first project and will serve you well. Nobody can see the 20th century coil spring lock, and I wouldn't bother to spend the money on a L&R lock (but I would for the rifle).
I hope you enjoy building this.