Steps to Over Come from boot loop .

1. Reboot to recovery by holding volume down button.
2. In recovery take Backup specially data partition.
3. than factory data reset from wipe menu
4. advanced wipe wipe system and cache. In Some Case That wan't solve your Issue In that Case Full wipe that is Factory reset is needed 
5. Install ROM
6. Install Gapps your choice I prefer PA Gapps.
7. reboot
8. install nandroid backup restore your data selectivly like call records sms in free version you can restore your apps also .
9. For Restore selectively Use Nandroid Manager app from Play sore. 

There Is Another Method also

1. Hold down Volume down Button while your phone Is rebooting.
2. It will boot to Safe mode which will let you uninstall the nasty app or theme (Nasty App don't used to be nasty but which is not compatible with your ROM some how.
3. Reboot Normally