1. Install instant root ( you get root access ) .....DONE
2. Copy the Amon Ra recovery image to the root of sdcard ( not in any folder )
3. Copy flashrec to the root of your sdcard
4. Install flashrec (Use a file explorer like astro)
5. Open flashrec. Then, Back up your recovery on first screen then in address bar put /sdcard/(ur amonra recoveryname with .img) and press flash. Typically it will be like this
/sdcard/recovery-RA-hero-v1.6.2.img
6. Go to the market. Download an app called 'Titanium Backup'. (Needs Root access). Install it. Click Backup/Restore. Click menu, Batch, Then select the option best for you. I select Backup all user apps. However you can select backup all user apps + data (but this may cause problems with your new ROM...but it works fine for me). Let the app do its thing.
Your done! Switch off the phone, switch it back on holding home key & power key
7. Once you are on the recovery screen menu there are a few options. Please do a nandroid backup before continuing. A nandroid backup simply takes a picture of your phone in its current state and if any problems occur you can restore your phone to how it was before. To do this click on Backup/Restore. Then click on Nand Backup. Wait for the process to finish. When it's finished reboot the phone and plug the phone into the computer and copy the nandroid folder to somewhere safe on your pc. Also copy the Titanium backup folder to your pc (this is the apps we backed up).
I recommend reformatting your memory card. To do this select SD card from phone menu, and click format. Or plug the phone into the PC and right click on the drive via my computer, and format it.
Now, put the custom rom (which should be a zip file) onto the root of the sd card. (I.e. Not in any folders). Do not rename the custom rom file or change the extension.
Then Switch off the phone, switch it back on holding home key & power key.
Always do a wipe before flashing your custom ROM. (A wipe will get rid of your data so please make a backup of your data using various apps on the market). In the Recovery Menu click WIPE, then Wipe data/factory reset, dalvik cache, SD:ext partition, battery stats & rotate settings etc.
8. Click on Flash Zip from sdcard and then it should show the Custom ROM. Click flash and wait for the ROM to install.
9. To enable Apps2SD (install apps to sd card) you must create a partition on the SD Card. To do this click on partition sdcard. We want 512MB as EX2 and the rest as FAT. After this has completed, go back to the partition SD menu and click on SD:ex2 to ext3.