The Husqvarna 135 looks nice and will most likely serve you well. I have two 245 and use them both in the woods and at home. And I was on a weekend course to learn the technique and have ppe. Chainsaw boots, trousers, helmet with hearing protection and visor, cell phone, first aid kit and a brightly colored smock. And I inform the neighbor or family when I'm going out and when (if) I come back... And I still have had some bad things happening to me. I have a few scars and a titanium screw in my left foot, for instance... Never ever use a chainsaw if you are tired! That may mean that you only can work short intervals with rest between. But after a while your strength improves.
It is always the first or the last tree that gets you!
The reason for having two chainsaw is that you then are sure to have one if something happens out in the woods. When working with storm felled trees it happens that you misjudge how the tree will move when cut, and the saw can easily be caught. Also you are sure to have spare parts. An alternative to having two saws is to have a spare sword. Then you can remove the saw and let the sword remain while you cut it loose using another sword.
Actually the saw itself is not as important as how good you are at sharpening the chains. It is almost like sharpening a knife, only there are a whole bunch of tiny knives chained together. And it makes a huge difference how sharp the chain is!
I usually bring 3-4 chains with me, and sharpen manually with a file only once or twice and then change to a new chain when it starts getting dull, and sharpen the dull chains at home. One chain lasts perhaps 1-2 good sized trees. Felling, cutting branches and cutting into logs. Also a good excuse for a breather...
I have a relatively cheap electric grinder, chain sharpener, that makes it easy. Perfect angles and symmetry. A low powered chainsaw with a sharp chain is much better than a high powered chainsaw with dull chain that can't cut straight.
If you use the chainsaw with a dull chain you will have to work much longer and harder and you will also most likely wear out the chainsaw quickly. Buying new chains is too expensive. Here you can have your chains sharpened where you bought the chainsaw, but I prefer to do it myself. I would never let anyone sharpen any of my knifes, and I sure am not going to let anyone else sharpen my chainsaw chains! (This may be a silly Swedish woodland quirk that you should ignore.)