Can I just go ahead and order up two new shoulders and have them installed tomorrow please?

Sigh...trying not to complain. I've it so much better than some do with really bad shoulders. I am going to allow them to inject the torn shoulder again next week, it worked well when we last did that in September and got a good period of relief afterwards - though I already know I won't really be able to use the shoulder for a couple days following. I should allow them to fix that one at least, but this is a really intense time at work (it's a 4 year cycle) and I cannot, and will not, take the time off work right now. Also unsure I would actually get relief - "fixing" joints is always risky. Also, the other shoulder is MUCH worse and I fear that the additional stress wouldn't help that one. So...I am placing my order for those pretty new shoulders up there on the shelf, they look exactly my size