Hide Price on Product Page and Replace with Contact for Price

[WatchTP]

Hey,

Please see my page www.watchtp.com

I have been able to replace the $0 with 'Contact for Price' on my collection page.

Now, I want to replace the same on my product page.

On the Title & Price, I want either remove the $0 or replace it with 'Contact for Price' 

Also, I want to do the same with the checkout button. 
Currently, I have removed the checkout button completely

Thank you!