How to remove spigen case from iPhone 6S Plus?

I have an iPhone 6S Plus and i have installed a Spigen Tough Armor Case on it. The case is really tough , but its so tough that taking it out is a really cumbersome job.

Two ways i have found are:

Pushing the phone out from the hole at the back(there is a hole for showing the Apple Logo) but i suspect whether this will make the phone prone to bending.

Second way was to start taking it off from the bottom , its not as hard as the other areas, because there are several holes for various ports.

How should i remove it actually?

I have heard that we shouldnt charge phone with specific cases on. But i've got no option other than that. It hasnt caused any problems till now.

Taking the case off damages my nails a lot. I dont want any scratches , so i have avoided any sharp items. Thus its a hard job to get the case off.

I want to take the case off at least once , but how?

By which way should i take it off?

Which is safe?