Is it ok to flash twrp over cwm or do i need to remove cwm first

Is it ok to flash twrp over cwm or do i need to remove cwm first. Hi i have been searching for this particular topic and found no definite answer. I am currently trying to flash blisspop rom on my phone and it says to use the latest twrp recovery. The problem is I have cwm installed on my phone. So my question is ok to flash twrp over cwm or set my default recovery to twrp