[Defy General] krestian:
This is the way I did it, coming from GingerSpeed (tweaked ROM based on MS2Ginger 4):

00 - optional. See below.

01 - connect to wall charger, reboot, vol down on blue led, Stable recovery.

02 - Wipe data, wipe cache, wipe Dalvik cache.

03 - flash Walter79's base fixed SBF 4.5.3-109-DPP-11-gingerbread-BL5-kernel.zip. I guess this step is optional, but I tried to remain safe all the way through so I did it.

04 - Wipe cache, dalvik cache again (NOT data)

05 - Flash CM10-20121018-NIGHTLY-mb526.zip

06 - Wipe cache, dalvik cache again (NOT data)

07 - Flash CM10-20121018-NIGHTLY-mb526.zip (yes, again)

08 - Wipe cache, dalvik cache again (NOT data)

09 - Flash update_for_18.10.zip. If you do it these days, it would be update_for_18.10_v3.zip for you. I applied these later as they were rolled out.

10 - Wipe cache, dalvik cache again (NOT data)

11 - Flash gapps-jb-20120726-minimal.zip

12 - Final wipe of cache, dalvik cache (NOT data)

13 - optional - see below

14 - reboot.

NOW... at this point... did it boot? NO. I got a black screen with the LED steady on red. (BTW, red LED is good, just not on forever). But don't despair. Unplug from wall charger, open the battery compartment, pull out the battery, and let it sit there for 5 - 10 minutes. Yes I know... the longest 10 minutes of your life. Hang in there, there will be worse ten-minuters. Put battery back in, boot - beautiful blue rolling Cyanogen animation, Breathe - you're almost there. Allow it to boot and give it another 10 - 15 minutes to converge. Media scanner, and other processes, will be having a lot of work. Welcome, you're done, enjoy, etc.

Now for the optionals:

00 - besides wiping the cache, and especially if you have a lot of media on your SD, it might help matters if you delete all the files in sdcard/DCIM/.thumbnails and sdcard/DCIM/.spmo before rebooting and doing all the recovery stuff. The media scanner on JB seems to be more picky than the one on GB and I learnt it the hard way - having a laggy phone that drained the battery very fast until I found out android.process.media was hogging the CPU. Believe me, you don't want to spoil you first impression on this ROM that way.

13 - when you flash this, all the cpu settings revert to the defaults, and OC modules are set to disabled also. If you have OC'd and/or UV'd your Defy, you'll probably want to make a note of your vsel values before flashing anything and go back to the CPU settings at this step to restore your values before rebooting. Don't forget to scroll all the way down and click on Save!, otherwise they won't stick!

Hope it helps. One more thing, there is even newer stuff in the dev thread, like a flashable battd-files kit by Walter79 and espaciosalter20 (creator of GingerSpeed) which improves battery life yet more. Can't really recommend this stuff since I'm only testing/tasting it today, but if you're feeling really adventurous you may want to also download if beforehand and flash it between 12 and 13 - remember to keep wiping cache and dalvik after every flash, data only before the first one. If you choose the safe side, you can always apply this later without a data wipe so it doesn't hurt to wait until you want it.

Cheers....