Need a Shopify Bot

There is an item going on sale at 8PM EST tonight. It is a Shopify site. I already have the item in my cart on the website. To my understanding, once I get it into my Shopify cart, I'm good. So -- what I'm asking here is:

a) should I just refresh the checkout page around restock time and click checkout? Will that remove it from my cart? or
b) will an add-to-cart bot be faster?

I'm obviously willing to pay a small amount, really I'd prefer help in creating my own. So, to re-iterate: I have the item in my "cart" on the website, but not through Shopify. What is the best way to ensure that I get one of these 50 units? (I missed the 50 this morning trying to do it manually :/)

Just click checkout when store tweets official release. Do not refresh, it will slow down the process. Although if you're logged in you cannot lose the shoe in your cart even if you refresh.

If bot has auto checkout option theoretically it can be faster, but I doubt.

Okay -- so I just checked, it doesn't remove it from my cart. What I have to do is, right at 8PM, click Checkout? I have an advantage in that it's already in my website cart, although it isn't able to be added to carts anymore since it's out of stock. So once I click "Checkout," it should reserve it in my cart, correct?