I also had it done, exactly as described by pp. I had an IUD and was having a heck of a time conceiving, so they thought my tubes were possibly blocked. Ended up the die went through fine, possibly a small enough block that the die pushed it open! I was told the cramping can be horrible, and they told me to take two Advil before the procedure. I was fine, craping was totally minimal. I also conceived the next cycle (was also on Clomid as my overies are lazy!), but lost the baby as a blighted ovum. No know relation to the test OR Clomid....just one of those things.
ps - the die is actually colourless...looks like water!