Just clear cache, and dalvik, and flash in recovery. Make a backup before flashing.
Speedtweak and zram are build in, swap is a separate file that you would flash if you want to use it. After flashing the kernel, you can open terminal emulator, which can be downloaded from the market if you don't have it already. Its a good tool to have, so I'd download it regardless. Anyway, type in 'su' hit enter, 'st' hit enter, and select your options. Most popular is probably '2' which is overclocked to 1.4 and undervolted. Select your governor, '8' or '9' which is InteractiveX, or SmartassV2. Some prefer one over the other, try em, see which you like better, hit '14' to exit. Type, 'exit', enter, 'exit' enter to get out of terminal emulator. Everything is typed without quotes. If you want to use zram, hit 'su' enter, 'zram enable' enter, or 'zram disable' if you want to turn it off.
You can adjust voltages even further in your file explorer app, in system>etc>init.d>01vdd_levels. Long press on 01vdd and bring up text editor if you want to make changes. I usually lower 245 to 800 and 368 to 825, but with voltages every phone is different. You just have to play with it until you know your phones limits. Otherwise just leave it alone if you don't feel like experimenting.
You don't have to use the Speedtweak settings, but it makes having an app like SetCPU redundant. It will default to stock speed and voltage settings with InteractiveX gov, if you don't use Speedtweak.
