Ditto to all of the above!
Firstly, if you don't feel confident about DIY, yes, get a detailer, but you are on a slope (as mentioned) in then keeping your car washed properly. That, or you budget a detailer every year IMO!
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Personally, since 911 ownership, I never knew how much there was to learn about paint, paint correction, what wax, polish, ceramic coatings, resins etc do, what the two bucket method is, when to polish, when to wax and when to compound! I personally found it interesting in learning about it all (mainly online forums, videos etc) but it's made me think about going into detailing, as I do love the satisfaction of doing it right. If my car or 911 goes to any garage, I request them NOT to wash it. No way will they ever do it right. I test everything I do on my A3 first, or the Mrs Merc, as thats a company car.
Secondly, I taught myself polishing on a neighbours '06 Polo he bought for his au pair (she lasted a month, maybe it was the Polo?!
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) He was keen to get in in tip top shape, he did the mechanics, I prepped and cleaned it. Sold it for ÂŁ400 more than he paid for it
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If you are able to practice polishing or products on another car (or go to your scrap yard and buy a ****ed up bonnet) and try products and polisher yourself on something else first.
Thirdly, any 'quick wash hand wash' that your local EU residents may offer for ÂŁ5-ÂŁ10 may shine for now, but how clean is there equipment? Also, the products they use will likely mask or hide the swirls better, but they are not repaired. This is why you use a detailer to correct the issue. I know you didn't ask about this, but thought it was worth mentioning.
Whatever you do, I wouldn't use TCut personally, as said above, it's very outdated and things have come a long way. I use a range of products, but most of my body work stuff is Meguairs.
HTH