Can anyone explain the kind of pain/sensation? If that question makes any sense.
Avoid the center of the chest idea at all costs. Pecs okay, sternum ixnay.
The main pain determinant is how much muscle and/or fat is between the tattoo and BONE.
inside the wrist is reasonable as the "only" thing close to the surface is a tendon.
the design you are tending toward (as in the supplied image) is small and made of lines as opposed to areas of color.
A tattoo involving areas of color will be a challenge. For a tattoo larger than the one you have indicated it would be a
good strategy to use linework and multiple colors to allow the artist to spread the work. Solid areas over bone, well ...
ever read Kafka's "In The Penal Colony"? Personally I would not suggest a "statement" tattoo as opposed to a personal
tattoo. Many artists will tell you exactly the same. If you want to make a statement the best thing is your actions or,
barring that, a t-shirt. Believe it or not, 30 years from now something that interests you as a statement now may seem
redundant or obvious like a tattoo that says "I have brown hair."
To get back on point, a tattoo in a well selected area will probably feel like a minor sidewalk scrape that keeps getting
lightly scraped for the duration of the tattoo. Like fingernails on a chalkboard some people can ignore it easily, others not
so much. Be excruciatingly HONEST with yourself. If a tattoo is in any way an effort to socially assimilate, don't go there.