There is no weight limit for trailers towed by category B vehicles (although if you pass your driving test after 1st September 2013 there is a 3500kg limit on the BE category) so you are free to tow up to the vehicles capacity.
If your cars manual says it can tow 1150kg then that is what you can tow. Since you are so close to that limit though it's a good idea to get as much of the weight as possible in the car, for example anything heavy in the boat which isn't bolted down should be put in the car, for example anchor etc. Also it will be better if you have a couple of passengers, as having more weight in the car will make the whole lot more stable. Be careful not to exceed the gross train weight though.
You don't need to be very experienced, you just need to know what you are doing. Don't drive like a lunatic, use the brakes to slow down and NOT the gears, don't brake whilst going round corners, leave yourself a lot more room for braking etc.
It just looks odd because not many people tow at the maximum capacity of their cars, especially not with small hatchbacks. My car is an estate and has a towing capability of 1900kg, which is relatively low but if you think about it, that's sufficient for a car transporter trailer with a saloon car or small MPV, or even a horse box with two small horses in.
This is perfectly legal and I could even throw in another 400kg or so and still be legal and safe: