Very late on board the welcome wagon, but Welcome! I'll not repeat any of the excellent advice you have already received here, but will add a few points and a product recommendation.
I shave with a straight (cutthroat) razor almost exclusively, but used a DE for about 20 years prior to that. The two things that straight razors have really taught me are blade angle and pressure. The pressure bit is pretty obvious when you have a naked blade with no guards against your skin; the angle takes a bit of learning. Roughly speaking, I tend to keep the blade at about 30 degrees (from the skin, not the vertical) when shaving with the grain, lower to maybe 20 degrees when going across the grain, and as low as 10 degrees when going against. Bear in mind that because a DE has a handle, the handle angle will be close to 90 degrees more than the blade angle. In all cases, the angle is adjusted on the fly based upon feel and sound - you will learn to tell when it is cutting optimally and subconsciously adjust to keep it so.
A second point is speed - let the blade do the cutting and do not force it. I have fairly tough hair on my lower neck but very thin and sensitive skin there. If I try to shave just as quickly as on the rest of my face, I get poor results and irritation. However, slowing down and allowing the razor to cut at its own pace gives excellent results and zero irritation.
I do 3 passes: with the grain, against the grain, and a final cleanup pass with the grain again. I skip the upper lip and chin the first pass and just let the lather sit and work while I do the rest. I only do two passes on these areas and never against the grain.
Finally, I have a product recommendation: Baume.be shaving cream. I use their pre shave gel and after shave balm as well, and always get excellent results. Look at
www.baume.be to see who sells them in the UK.
Good luck and keep up the good work!
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