Go slow brother... And keep walking.
The biggest challenge is too make sure you are drinking enough and getting enough Protein. Take your time... Eating too fast is the a hard habit to break and it can cause some discomfort if you don't go slow. What you bite sizes as well as you move to solids.
First month is challenging by the second month it all starts to come together. Listen to your doctor, dietitian, and yourself and you will do the right things. Hell you have come too far not to. The pounds will start flying off and then they won't and then they will... This journey is a bit of a roller coaster. Keep the faith!
I'm 6mos out and have dropped about 95lbs and I am not the most disciplined person when it comes to going slow and exercising. Have never regretted a moment during the last 6 months! Good Luck.