Don't wanna mess with the tabs on the engine cover unless I have to.
You probably should just take this to a mechanic if you think removing those push pin tabs is past your mechanical ability. You can take them off with pretty much anything, screwdriver, pocket knife whatever. You just pop the middle section up then pry the whole thing out. Once that middle pin is up you can pull them out with just your fingers. Not trying to be a jerk, but you have a car that's showing serious signs of coolant system problems (temp gauge going up just in a short idle at the drivethru) and you're flirting with thousands of dollars in repairs if you kill a head gasket or warp a head.
To put it in perspective, lets say you just rip every push pin out and destroy them. You can get a 40 pack of replacements for less than $5.