After finding your dream bike and making all of the adjustments, it's time to focus on parts. Keep in mind that if you aren't satisfied with some of the components on your bike when you buy it you are able to trade them in for others. This usually turns out to be cheaper when it comes to upgrading.
Saddle - Finding the perfect saddle is not easy and may take some riders many tries before they find it. Here are some tips: make sure that the saddle is narrow enough that you can easily slide off of the back, also more padding is not always better! In some cases it will rub against your thighs and after a long ride will become very uncomfortable!
Brake levers - Most brake levers can be adjusted with an Allen Key by loosening or tightening the clamp to fit your needs. Here are the following ways that they can be adjusted:
1. Up or down - You can rotate the levers up or down until they are comfortable. You shouldn't feel any kind of pull in your arms.
2. In or out - You can move the levers closer together (towards the center) or farther apart (towards the grips) depending on your shoulder width.
3. Reach adjustment - You are also able to adjust the resting position of the brake levers either closer or farther from the handlebars. Just be forewarned that your break setup may need to be adjusted after this.
Handlebars - Most handlebars can be rotated backwards slightly at the stem clamp. The best position is found by just getting on your bike and riding!
Handlebar stem - You should be able to adjust the handlebars so that they are comfortable. If you cannot do this, buy a stem that is comfortable. There are many different rise angles, lengths and quill lengths (part of that stem that fits into the fork).