Use them watching television. Use them in noise. Use them when you do not need them. Unless you use them during virtually all your waking hours, your brain never learns to interpret the world through the hearing aids. Infrequent or inconsistent use is a formula for hearing aid failure.
Some people are able to leap right in with amplification.
Others do better with a more gradual break-in period. If you are one of the latter, these practical hints will help you over the hump. For the first few days, wear your hearing aids only as long as you are comfortable with them. If you are fatigued after using them for a few hours, take them off. The next day, use them for an hour longer than you did the day before.