Camping or Tactical Entry?

Do you guys know how to handle a situation where you have to enter a door? I have problems on both ways. I if i camp and wait for someone to come out i waste time and sometimes get kicked. If i do the tactical entry i somewhat die cause of being outgunned cause there's either a sniper or they camp and wait for me. I have earphones and a handy close range gun = p90. Can you guys help me? Any items i need?

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