Here is a straightforward look at this topic for Malachain.
A mortgage offer compresses a huge decision into a few numbers. The ones that matter are the interest rate and how long it is fixed, the total you will repay over the full term, the monthly payment when the fixed period ends, and the fees for leaving early. The headline rate alone says very little about which offer is cheaper.
Compare offers on the total cost over the fixed period including arrangement fees, then ask what the payment would be if rates rose by two percentage points. If that number would stretch your budget, consider a longer fix or a smaller loan. A broker can explain the wording, but the decision about how much risk to carry is yours alone.
There is more to learn on this subject, and the linked website goes into greater depth. Treat this article as an introduction rather than the final word, and check any important decision against up-to-date, reliable sources before relying on it.
If you try any of these ideas, start small and adjust them to your own situation. What works for one person will not suit everyone, and it is fine to keep only the parts that help. Writing down what you changed, and what happened, makes it much easier to see after a few weeks whether the effort was worthwhile.
The most useful step is usually the first one. Pick a single suggestion, try it for a couple of weeks, and then decide whether it is worth keeping. Small, steady improvements last longer than ambitious plans that are hard to maintain once everyday life gets busy again.