Define what 'small' means for you
Small can mean 20 or 70 depending on the couple. Define your number before you start touring. It changes every conversation you'll have.
Find a venue that scales down well
Some venues feel right with 30 guests. Others feel hollow. Look at photos from weddings at your guest count, not their max capacity.
Don't over-vendor the day
Smaller weddings rarely need a band, a DJ, and a separate cocktail trio. Pick the few that matter and invest in them.
Spend on food, photography, and light
Three things that pay back disproportionately at a small wedding. Skip the favors.