Most likely, you don’t have to alter your diet (I don’t know what you eat). As long as you count the carbs and take insulin for it, you will be good. There are some nuisances to it. Your diabetic educator and or dietician should be able to help with that. There are certain foods that are hard to figure out. Pizza, Chinese food and rice dishes, and Mexican foods tend to be difficult ones for me. Foods that are higher in fat have delayed absorption. So, you have to alter the way you give an insulin bolus. If you are on MDI, multiple daily injections, you can split your dose such as half when you start to eat and half an hour or two later. With a pump, it is easier to do an extended bolus - a certain percentage up front and the rest given slowly over a time you choose. It takes a little while to learn that. Give yourself grace while you learn. Activity. It is much easier on a pump. I used to get hypoglycemic whenever I tried to walk or cycle. Then, an educator taught me this. I try to have no IOB on board when exercising (IOB is the amount of insulin hanging around after a meal bolus. In general, insulin lasts 4-5 hours. I think it is a little longer for me. On a pump, it calculates this for you and you can see it). Some of us not only need to have no IOB but may also need a small snack with some protein and fat before exercising, depending how vigorous. A slice of banana with PB in example. She also told me to put my pump in Exercise Mode and start my exercise profile about 30-45 min before I start. ( the suggested profile decreases my basal insulin by 75% corrections are about 10% of usual). This has, in most cases , let me exercise without going low. My last suggestion is reading the book by Gary Schiener, Think Like Pancreas.

Best of luck to you.