As you have probably noted, there is no screw to open the iPad 2 and in fact it make opening this iDevice much more complicate that an iPhone for example.
This is the reason why all iPad 2 guides are marked "Very difficult"!
I wouldn't say it is too risky, it depends on you, your skills and probably also your tools. If you want to make a good job you will have to use the good tools. Look at this iOpener at least!
- If you decide to access the volume button hole from inside the rear case, the minimum require disassemble is the display. Look at this guide so you will have a better view on what you would have to do.
- Once you will have the screen out, you will have a better view if further dis-assembly is required. Any further dis-assembly should be piece of cake after what you've done just before!
- Also remember that you're gonna have to re-install the screen with new adhesive strips after that. (New adhesive strips available here.)
Let us know what is your decision, and good luck!