HP/Compaq :: HP Envy Series Exchanges, Warrranties, And Service Policies

I got an HP Envy 15 recently with the Bing CB deal on the day it was released; but have found that an SSD on that machine would probably be necessary for my needs. I posted some questions in the owners' lounge, but haven't since gotten any response, so I assume that people there may not know the answers. So I want to see if people in the broader HP forum would be familiar with these things.

When I purchased this machine, HDD was the only option, and the HDD is not listed as a user serviceable component. But in the last couple of days, the SSD option is up on the HP website; so I can see several options that maybe available to me, depending on HP policies. Is anyone here familiar with HP policies regarding:

1) Returns of products, does the 21 days mean 21 days from purchase, or 21 days from the time that I receive the product?

2) Returns of products that was purchased with warranty? I did purchase with the 3 year accidental; but I have not activated the service with the machine yet.

3) Exchange of products, how easily could it be done through HP, for the same machine of a different configuration?

4) Bing cash back, would it still be valid if I decided to exchange it for the same machine of a different configuration?

5) Since the HDD doesn't seem to be a consumer serviceable part, would it endanger the warranty if I changed out the drive myself? Or would they even care about that?

6) How easily can HP parts such as the 1.8" brackets be obtainable from HP, some time in the next few months; based on experiences with HP products in the past.

I guess depending on the answers to these questions, I would have the option of A) returning and buying anew; B) exchange for another configuration through HP; C) change out the HDD myself with a 2.5" and just forget about it; D) wait until the appropriate parts are available, then change it out with two 1.8" drives.

I would like to keep the BCB; but if there is no other way of getting an SSD into that machine, then I might just have to let that go, and try to find some lesser discount to work with.