If it is seedling you will need to acclimate it. I would be cautious about throwing any plant into the sun let alone a seedling.

I'm pretty sure they are sending me a seedling. Even if it's not, it's definitely a small plant. Should I put it in full shade for a while until it's a little more mature? Or just until it gets used to the heat?

~AOK

Here is a few questions to ask your self about a new acquisition.
How does the climate/growing conditions differ from yours?
(like in a greenhouse or outdoors)
Is it a seedling or pup?
These questions will give you and idea of what growing medium to start with too.
Most of the time plants acclimate easy but our average daily temp here has 102.3F for almost 2 months.
I had to cut back feeding my plants since fertlizer softens the plant to speed up growth. This weakens the plant structure.
It is more susceptible to heat or cold.
This plant likes temps in 50F range to 90F
Sorry I didn't mean to write a book.

My B. reducta came in the mail today, and it looks good. It's a little green and spread out, but I'm going to try and get it to form the more tube shape and yellow color they have in nature.

I have it planted in LFS. It's sitting in full shade for now. I'm going to slowly move it into full sun over a period of weeks.

Hopefully it will do okay. It's only about six inches tall... Wish it luck!

~AOK

Broc. reducta comes from the tepui tops (table top mountains) in the Guiana Highlands on the border of Venezuela, Colombia and Brazil. It's habitat is about 2 - 3,000m above sea level and the environment is nutrient poor bare rock because the Tepui summits are deluged by 10,000mm of rain annually and the diurnal temperature range is between 3 and 26 degrees C. So your reducta is a super tough bugger that can take more water and UV than you have on offer in your garden!