Pushpak Taunk, MD is an Advanced Endoscopist at University of South Florida/Tampa General Hospital and a Lifelong Learner.
You will get to the cecum. I promise. As fellows, we always worry about our ability to get there. Even after being in practice for 10 years, I will come across a colonoscopy that I can't complete. Focus on learning good technique and spend time in the endoscopy suite doing as many procedures as you can, it will eventually click. There are many resources available, including on the ASGE website and GI Leap, which can help you navigate learning the basics of colonoscopy.
GI fellowship is busy and figuring out what/when to read is hard. Each of the major societies (ACG, ASGE, AASLD) have come out with guidelines on every topic that will give you a base for building your knowledge. There are also a few pocketbooks that can be helpful (i.e., Yamada's Handbook of Gastroenterology). I would read a short brief on a particular topic during your workday. Trying to read after a long day is tough and generally less effective for retention.
In the beginning when seeing consults, you will learn to decipher who you need to scope and who you can manage medically. After honing those skills, don't forget that it's not just about doing the procedure. Teams are looking for your expertise, so remember to continue providing broad differentials (when applicable), discuss various other testing modalities and focus on what else you can do to help the patient, besides just doing a procedure.
Spend time exploring all aspects of gastroenterology. You never know where you will end up and what skill set might be required for the job. If there is an area within GI that is not available at your institution, you can reach out to other institutions to set up a rotation and gain further exposure. Even if you are a budding advanced endoscopist or IBDologist, being comfortable with all aspects of GI will give you flexibility when looking for a job. It will also make you a better gastroenterologist.