I’d highly recommend it, since it not only makes the separation of the screen easier, but also prevents the breaking of the screen an other components from using too much force.
Word of caution: Whether you use a heat gun or a hair dryer, keep the heat moving along the edges and not stationary on one spot, as it can cause damage to the screen and other parts of the phone. If you have an iOpener, place it for a few seconds on the edges of the device every few seconds. This also should help opening the device with more ease.
Hope that helps.
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