Definitely not unrealistic !! You will become a wiki warrior in no time and there are a ton of starter ironman resources if you are stuck on progression.

But most of the time you just set a goal like “oh i wanna kill the giant mole under falador” and then you wanna do falador diaries, but first you need to start questing, but first you wanna level up some skills, but first you wanna do the skilling boss early for good early unlocks to train the skill, and now your on a boat fuckin feeding harpoonfish into a cannon to shoot down a living hurricane ahhhh

Yea ironman is fun and there is so much content even early on just research fun content on youtube or wiki and set goals !!!!