The simplest way to do a daily protection is to simply stand in front of the mirror and visualize something that covers your entire body. I've heard all sorts of things ranging from a cloak to a force-field like shield surrounding them. Feel it harden into place and any time you think about it, reinforce that shield.
The next addition that you probably want to do is the purification step. This will cleanse yourself of the negativity that has built up throughout the night (and maybe the day before if you forgot yesterday's protection). The easiest way to do this is to simply take a bath and feel the water cleansing you. The key to this step is being in the moment and really feeling the negativity and stress wash away from you. Bonus points if you're using a cleansing and purifying essential oil or scent in your soap (double bonus points for homemade soap specifically designed for this purpose).
Yes, these work and they work well. On the other hand, these are things that are easy to forget. If you have an action that you do every day, integrate that into the ritual. The easiest for many people is to charge a piece of jewelry or an item you wear every day with shielding properties. Cologne and perfume work as well (especially if you add a bit of protective essential oil to it). I'm sure that deodorant would too, I just have an issue with putting plastic into a ritual setting.
In order to charge the object, sit down in a quiet place. You can do whatever ritual stuff you deem important like adding candles, making a circle, etc. Now, build up that shield visualization. Feel the strength of it surrounding you. Once you know that it's as strong as you can make it, push that shield into the item. Now anytime you need to, just draw some energy/shield from it. I'm a very big fan of the jewelry technique because the jewelry will add to the strength of it. Some good types of jewelry would be anything that is gold, anything that has a red or yellow stone. If possible it should be something that touches the skin because skin contact facilitates any kind of energetic work.
This is the simplest of the defensive magick techniques, but daily protection is a very important part of keeping your energy and emotions clean of any other influences. Check back tomorrow for tips and ideas for how to effectively shield your magickal/spell work!