Me and DSis have a big age gap (5 years), it worked about fabulously and I'd always imagined I'd take time between DCs (both DH and I want 2), waiting until DS was in nursery (aged 3) to make things easier. However we're getting on in life and DH has just suggested we start trying again this year 
When DS was born (and sometimes still tbh) I just kept thinking 'how the heck do people manage this with other kids/while pregnant'?! If we got pregnant as soon as he's suggesting we start trying (a fair chance as we did last time) DS would be 2.2. I know this is far from unusual but I'm scared! Please give me your experiences, good and bad and some advice!