Are you using resistance bands? Trainer Jesse recommends them; they’re “great tools to help a client build strength and eventually move to using body weight.” To do a band pull up, attach a resistance band to your pull-up bar and step into it, like in the above picture. Trainer Jesse suggests you “keep your core tight, and make sure the band is in a secure spot on your feet.” Complete pull ups as normal, being sure to carefully step out of the band to avoid a snap back.
To perform assisted dips, start by looping the band over the handles. Place your knees on the band and grab a handle with each hand. Lower yourself down until your arms make a 90 degree angle and then push yourself back up, while keeping your core tight.