Indefinite leave to remain and citizenship are often spoken about in the same breath, as if they were one milestone. They are not. They are two separate steps, and the gap between them is where good timing earns its keep.
Two doors, not one
Settlement gives you the right to stay without time limits. Naturalisation makes you a citizen. For most people, the first comes before the second, with a waiting period in between. What that period looks like — and what you do during it — shapes how smooth the final step is.
The mistakes I see are almost always about rushing. Applying for citizenship the moment someone thinks they are eligible, before the clock has genuinely run. Travelling heavily in the window that matters. Letting a small administrative detail from the settlement stage go unresolved, then meeting it again at the worst possible moment.
My advice is usually the same: secure settlement properly, then treat the waiting period as preparation, not dead time. Keep your records clean. Watch your absences. When the door finally opens, you walk through it without a single loose end behind you.