Help and Tips regarding Experience verification for applying to PMP

Dear Gurus,

I am in the process of applying for PMP certification. The experience section seems to be much in details. Would you please share some tips and experience?

Is it necesary that one has to experience in all 5 process areas for a single project to be eligible for the PMP application? I mean I have worked on some projects where my participation was either in Planning and executing Or only planning.