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In America, we can skip almost all of your greentexted steps because we all have cars and can just drive directly to the trailhead. However, there are a number of things I do that are missing from your list.
For longer trips, I always check the following things, using various resources, including guide books, websites, and talking to people who work in the area.
>character of route
Does it involve steep climbing? Does it involve a lot of stream crossings? Does it involve walking through areas that get really muddy after a rain? If my route goes off trail, can I even do the route in the allotted time? If I'm following a trail, how well marked is the trail?
>current conditions
Any area/trail closures due to storm damage, flooding, etc? Was there a forest fire in the past several years that has resulted in downed trees across the trail? If it's early or late in the season, has any snow accumulated yet? Is the road to the trailhead even open?
>hiker recommendations
Have other hikers done this trip before and posted trip reports online or published them in a book? Did they find it easier to take one alternative in the route instead of another? Are there any good camping spots to hold out for? Any camping areas that get too crowded?
>water sources
Where are the reliable ones, and are they close enough together that I can plan on only carrying X amount of water? How good/bad can I expect the water to be?
>animals
Is this bear country? If not, are there other animals that will go to great lengths to get into my food bag?
Technically, I should be checking for fire bans too, but I'm not going to follow those rules anyway, so I don't give a damn.
Also,
>So here is how I picked the trail, I just went on Google-maps and looked...
Do you mean you found sections of trail or sections of land? You should NOT try to plan an off-trail trip based off Google maps' satellite pictures. Find a real topographic map.