Yes, blow out the lines with your compressor set no higher than 40 psi. Elbows in the lines may not just drain fully with the low point drains plus there will be slack points in the lines that may not drain without help.
P traps on the sinks and shower will be fine with just pouring in the antifreeze. Remember to open the toilet flush valve and outside shower too. Some people get by with just blowing out the lines while others prefer to pump the antifreeze throughout the lines. Up to you on how comfortable you are on doing either.
Remember to bypass the water heater and drain it separately.