I used two coats of Whimsical over one coat of Zoya Kristen.
While Whimsical can be slightly irritating to put on, just go slow and try to use a thicker coat. When I started, I used really thin coats and didn't get very much glitter. After the first few nails, I just grabbed a bit more polish on the brush for the rest.
I don't have DL's GITA, but I have seen a lot of dupe posts comparing the two. If you can find Whimsical, go for it. It is only 5 dollars compared to 18.
I found mine at Rite Aid, but it should be anywhere Revlon nail polish is sold.
*Products were purchased by me, for me. All opinions area my own.*