When I first started ordering from Stampin Up, I remember thinking it was such a pain to trim and mount my own stamps. But now...I wouldn't have it any other way. I really appreciate having the option to custom mount my stamps the way that will be most useful to me. Keep in mind, Stampin' Up recommends never trimming your stamps closer than 1/2" in diameter, so I was careful to not trim too close on the two sentiments I separated from the images.
I hope that might help you as you decide how to mount your Happy Heart Day Stamp set....it's a great set and even better now that I can use it all year long!
Have a great evening = ) !