1. Always Seek More Respect.
It is always good to know the reason why you are being respected, and how this respect means in your absence. Try to create a respect that last in the mind of people whenever your name is mentioned in a conversation. So whenever you are around you can be assertive gently without hurting someone or making people think you are fighting for that thing.
2. Building up a strong social relationship.
Try to build up a bond between you and people around. Be friendly with random people regardless of their age group or social position. Be very confident in making them your right pals. When people sense that you are thriving socially and have no problem making things work out between you and everyone around, they'll sense coolness in you. So in this case, be cool when the time to show assertiveness comes. Stand on a simple talk to win the position ahead of the "nice guys", they're nice and you are cool.
3. Be More Talkative.
Every action requires a vocal support. If am on the line and you just enter my front without uttering a word, how do you want me not to sense your assertiveness mixed with aggressiveness? You find a way to circumvent people's thoughts confidently by making them think you deserve that action. Remember, in this case you can only work on the passive who don't know how to start arguing in the public. So they're either defendless or anxious.
4. Check Up the Focus of Others.
Do not be assertive when everybody seem to be focused in getting his own way in. You know, it is not most to be assertive or show assertiveness wherever you go all the time. In order to be more assertive without being aggressive you have to give chances between the zero level of opportunities. Wait for the chance to get in and finish first, since you don't always want to be that nice guy that always finishes last.
5. Keep a Smiling Face.
Your face appearance matters alot to show whether you are assertive and aggressive or you're just acting your normal nature. Give more concentration on smiles, while giving out a teasing jokes to those you want to be assertive on. Leave them with the state of mind, that you are nice and deserve to have it more and before them. That's why in order to be more assertive, you have to be very unusual to people, so that no one will think of ways to circumvent you.
6. Consider Assertive Clothing and Outfits.
Don't you know we have assertive outfits? Putting on that rugged jeans and T-shirt will not help you out when your actions point you to the negative direction of aggressiveness. A simple assertive fellow wears simple clothing, represent himself in the most appropriate way and move into work on people without being aggressive. Wear respectful outfits, a plain with a stucked in shirt would be alright, or you may add suit to look more executive and charming.
Learn to express self assurance, confidence, and high expectations whenever you want to take things to the next level. In order to be more assertive without being aggressive, you must put this into considerance, that patience is also a virtue in life. Do not haste, do not look desperate, for only children push alone for long.