Hi there JJ,
you don't mention if you are male or female or your age, but here is a link from the homepage on this site about women and cholesterol lowering.
Remove the (*) and paste the link in your browsers address bar. If you are sure you want to reduce your cholesterol then the porridge approach does work although slowly. In reality as long as you are active and eat a varied nutritious diet and don't overindulge too often, then you should be ok.
People have different cholesterol levels and Dr's want everyone to be the same, what level works for one person may be disastrous to another. Lowering your levels may and probably would have a small benefit, but I am pleased to see you have had the good sense to look for answers before the problem of side effects start from taking medications.
I will leave this as is for now, there are plenty of folk on here that will have a better knowledge of dietary needs and what works best, so I will leave the explanations and food types to them.
It really is good to see someone finding the answers before they become another addition to this mess.
All the very best,