wah if people can pylon you at your base then you're pretty much like the AI.

if your oppo builds cannon in your base just pull one worker and tail that probe...if there's an opportunity, pull all your workers to kill that probe...

scouting your opponents base will only tell you something's up if the forge is up early...but he could be anticipating that you are cheesing as well...still, most likely = cannon rush

scouting your own base will tell you that a proxy pylon's coming up...and you will need to kill that pylon before it warps in...so if you see pylon warping in...pull all workers to destroy/cancel that pylon

if that oppo cannon rush fails...you should be anticipating a tech switch to zealots...get cannons in your base and you will be fine

Shy again ah? Teach mah.