As someone that repairs phones regularly, it should require heat to loosen adhesive or you risk bending too far and piercing the battery or have to spend significantly longer slowly prying with a precision plastic prying tool or guitar pick.
I wouldn’t normally recommend a knife for risk of scraping the thing up, but for pure functionality fine cutting, a scalpel or craft knife cuts through the glue holding things fairly easily and fits in the thin crevices.
It would definitely require I’d say electronics 1 to understand this, one could pre-heat the phone on a stovetop of sorts and wear heat resistant gloves to pry the glass and glue sandwiches apart with a thin tool, a knife would do the job honestly so fine cutting plus heat plus a soldering iron?