Slim
The moment that comes in, hook it up, set the temp and let it smoke overnight. Monitor it for the first hour to make sure pellets are running and it comes up to temp.
Like all electronics, shipping can be tough on them and you need to call CS ASAP if it doesn't work.
If it was me, I'd do on PB to practice on Friday, ribs on Sat and cook as I indicate below.
You're asking pretty basic questions, are you new to butts and ribs?
Rule one. NEVER plan your first cook be a big cook. Just not the best option. The key issue is timing and we're not baking cakes here, meat has a funny way of doing it's own thing when it wants.
But we'll help.
How big are the butts? the problem will be trying to time it for an evening eat. They'll take "approximately" 12 hours, plus or minus depending on the size. The safest thing to do is put them on at midnight. Here's how.
And you'll see why you don't want to do this for your first cook.
One of the features of the FE is the cook and hold. But use that to your advantage. Set the "cook" temp at 180 and set the time for 4 hours. Set the HOLD temp for 250. At the end of 4 hours, it will go to HOLD but at the higher temp (you can set hold for any temp, 140 or otherwise).
Start checking when you wake up. If you're REALLY new, you can get up at 4am and check to make sure it went to 250.
You'll be pulling them off between 10 and 4, just depends on a lot of factors, the size especially. Use the FTC method to hold (Foil, Towel, Cooler). Two butts will hold for a long time.
What size of BB's. It matters. Small vs. Loin backs.
I HIGHLY recommend a practice run on Saturday for the ribs. You want to figure out the timing. For me? I do all my ribs at 275. FE taught me that and I love that temp. They could be done around 3 hours, depending.
Oh, did I say don't wait until Sunday to try this the first time