change when warm??

Was going to change plugs right now. Does the block have to be cold when doing this? i have heard it is best to do when cold because of something with the threads?

 

I would recommend changing when cold, so you won't burn yourself on any hot object in that area.
So yes, wait and let it cool down.

EDIT: This thread is also a good guide through the whole process. http://www.tacomaworld.com/forum/technical-chat/30479-how-spark-plug-change-1-gr-fe.html

 

Yes but can i ruin anything like threads changing when warm? Its been about an hour since i got home

 

You're totally fine, go ahead and change them. Just make sure to use all the right tools and take your time.