TWRP for the Motorola Moto E has been released and that means you will now be install ADB and flash new ROM. You will also be able to sideloading. There are few bugs though such as touchscreen would not work if you suspend the phone. So do not make go into suspended mode after you are in TWRP recovery mode.
To install it on your Moto E you must first unlock the bootloader as other wise you will not be able to do any sort of modifications to your device. Then download the recovery image file from here and make sure you have set up ADB on your computer. Then run these commands.
adb reboot bootloader fastboot flash recovery recovery.img fastboot reboot
Reboot to recovery and type
adb reboot recovery
That is it. You’ve successfully installed TWRP. If you want CWM (clock work mod) recovery you will have to wait bit longer as developers are still working on it.