It's no secret that I like setting aside a specific budget for my trips. But if I have limited funds (and still itching to travel), I make sure that I 'book and plan ahead'. Here's how I do it:
1) I choose a destination.
2) I book my plane or bus ticket a few months early (look for seat sales!).
3) I check online sources for reviews and recommendations and then narrow down the best affordable rates for accommodations and tours, especially if I'm going DIY.
4) I book my accommodation (eg. Airbnb, Agoda, Booking).
5) I make a projection of my expenses by creating an itinerary based on figures that I've gathered online (list how many meals per day, how many nights in a lodging, how much for commute fees, etc.). Remember, it's okay to work around estimates, as it makes for a good buffer too.
6) I start saving up for the trip by allocating a certain amount from my earnings every month.
Allocating my funds for a trip helps me track how much is still needed to achieve my monetary goal.