There should be nothing difficult about teaching at secondary-school level the syllabus content of a subject you love and that you’ve got a degree in, and have been trained to teach. Planning lessons, teaching, setting and marking homework/assessments should be enjoyable. And it shouldn’t be that hard, should it?
are you for real? Enjoyable and easy? Yeah, absolute doddle getting info into heads and then getting it out again in a format that will get marks in exams. You totally ignore the need for differentiation and assume all kids are the same. They’re not. They come into school with a willingness to learn, a desire to disrupt, learning difficulties, mental health issues, wet on a rainy day, hungry, witnesses to domestic abuse, abuse victims themselves, angry with friends, stressed about expectations in school and from parents and peers, unwell, worried about a sick family member, with holes in their shoes and dirty clothes, in desperate need of a haircut and no money for lunch. In a class of 32, maybe a third have a desire to learn and do well. The rest not so much.
Try preparing resources for a group of 32, average ability, with target grades from 3 to 5 (that’s 4 to 6 if we are to meet all other expectations), one dyslexic to the point they can’t read, 2 others who need resources on different coloured paper or background, at least one with ADHD and 3 who will talk over you all of the time, regardless of the behaviour system or any punishment you can come up with. A couple who are desperate to learn and one who can’t control their temper and is happy to take it out on whoever is sat near them and just looks wrong. The rest will dip in and out, depending on how entertaining you are, the activities you come up with, the time of day (better AM than PM) and the proximity of the next assessment. Now do that 4 to 6 times a day and manage the pastoral needs of a tutor group.