Culture shock is very real and could happen to you. Make sure you learn about the culture you are now living in, it will help you enjoy living in this amazing city. Culture Shock Jakarta is highly recommended reading.
No matter how frustrated you are, remember to smile and be friendly to the locals. Bouquets get you what you want, Brickbats lead to frustration
Although many Indonesians speak some English, most do not. Take the time to learn some basic words and phrases to help you get by. Learning Indonesian - an excellent free phone app
Don't be afraid to ask other expats for advice; it's a good idea to get tips from someone who has been through it all before.
Leisure things to do out of Jakarta is a presentation by Bill Lloyd from Asian Tigers, an ANZA sponsor. It gives you an insight into the many activities and places to explore in and around Jakarta and West Java.