OP, you are basically doing what I did.
This does have a chance of bricking your system, so be careful and lucky.
Steps:
1. Download 2.0b1 and 2.0b2 gw firmware. To download b1, just copy the download link for b2, then change the link so it points to b1 instead.
2. Put the exploit installer .nds file on your 3ds-compatible ds flashcart and run it.
3. Put the 2.0b1 Launcher.dat on your sd card.
4. Perform a NAND backup from the GW menu (hold L while entering ds profile)
4.5- Copy this NAND.bin file to your computer.
5. Format emuNAND after doing a NAND backup (still on 2.0b1)
6. Run emuNAND GATEWAY mode, and make sure it says GW3D 4.X-X
7. Configure your internet settings, and perform an update. After the update is complete, you will be sent back to your normal NAND (still 4.X)
8. Turn off your wireless switch.
9. Go to your system settings in the real NAND, and remove your internet configuration. This is here because of a bug in 2.0b1.
*NOTE* Things start having a reletively small chance of brick here on out. Every time you run the exploit with 2.0b2 installed you have a chance of brick.
10. Put 2.0b2 launcher.dat on your SD card. Perform a MD5 checksum on the launcher, and make sure you have no files on your SD card that have weird dates.
11. Run the exploit again. Go directly to the the eShop and download everything you might possibly want right now.
12. After finishing your eShop buisness, turn off your system.
13. Turn your system back on. If you got bricked, you should now know. Shut back down again.
You are now safe, provided you were not bricked already.
14. Put 2.0b1 back onto your SD card.
15. Go the the NDS profile, and run the exploit while holding L.
16. Enter emuNAND classic.
17. Your games should now be there. They should run just fine.
Because you are using b1, the system settings, eshop, and miiverse will all cause crashes if run.