The most important thing is to know your bike so you can take advantage of its features, for example : the shape of the frame, the shape of the handlebars, can determine the type of modifications you will incorporate into your bike.
Note : in this instructable many instruction and notes are written onto the pictures.
Coming up...Safety first.
The first step is the easiest and most obvious.
To increase one's safety while riding a bike, one must make sure his bike's performance and visibility are as good as possible.
Step 1: Safety first
Bikes are great because they carry us around, but they aren't that great when they break down in the middle of the trip and you injure yourself or when you lost the key to the cable.
So the best thing to do about it is to take some tools, a first aid kit and a spare key with you on your trips.
Just one problem, the stuff mentioned above is pretty uncomfortable to take in your pockets or bag, and also what if you forget your kit at home ?
The answer to that problem is... well you'll have to scroll down to see it in action.
Step 2: Hidden stuff
Now that you have a spare key on the bike in case you forget the other one at home, it's time to prepare for the next worse case scenario : your brakes get loosened.
To be prepared for this case you'll need an Allen key that fits the bolts in your brake system, some electrical tape and a neodymium magnet.
Oh yeah, I almost forgot. You'll need to paint the Allen key to match the color of the suspension cylinder for camouflage.
PS. the instructions are in the pictures.
Step 3: Hiding the tool
Doesn't it ruin your day when someone steels your wheel or saddle ?
Well, not anymore.
PS. Please pay attention to the writing on the pictures.