Good info. Plastic tool is called a spludger / spudger or just a plastic pry tool.
If you have a heat gun and liquid flux that's a better option.
Use some weights - can be had online - or use some coins to apply the weight to the thing while you heat it.
Hair dryer is the "local" way of doing things. Try not to use some hair dryers - ionic ones are better (and more expensive). Regular dryers have a higher potential for static which can kill the device totally.
I've gone Huawei for some time now and not going back. Excellent devices. Cheaper than the competition. Not the best performance compared to similar devices, but unless you run certain apps/games you won't see a difference. Daily tasks are just as quick as flagships. Half the price or less. Next phone will be the Mate 9 I think.
Knowing the solution doesn't mean knowing the method. Yet answering correctly and regurgitation are considered "learning" and "knowledge".