Unless you have kidney problems, you're not going to overdose on protien, though you may find yourself constipated if you keep your levels high. If you consistently consume high levels of protien you may develope kidney problems, but that's not going to happen over night. Ideally, you should be getting protien from whole food sources and it should be paired with healthy fats and some carbs. Healthy fats are essential to hormone synthesis along with other functions which are necessary for muscle growth so don't skip the fat.
You can calculate your present lean body mass and figure out the amount of protien you need from that, and also the number of calories you need to consume to build muscle. There is not strict rule about when you eat or how many meals you eat during the day, so if six is unrealistic to you figure out what is realistic. If time is an issue for you consider prepping meals for the week on Sunday so you have them ready during the week and you don't have to rely on so many shakes. You can cook in bulk and freeze it. Don't forget nuts and legumes are also great protien sources which also make great snacks. I make my own protien powder and use it for shakes and protien bars - it takes 10 minutes and it tastes amazing, and it comes from whole food sources so I know its bioavailable.
I think it's really important that you research metabolism and nutrition so you can bulk safely. Also research your protien powder as there are some excellent blends, there are useless nonbioavailable blends, and then there are some with very questionable ingredients. It's worth paying the extra money to get quality useable safe protien. If you're going to be consuming large quantities of protien make sure you drink a lot of water.
ETA:
- here's a link regarding protien powders. I highly recommend Garden of Life as they make quality bioavailable products. Their protien powders have also been rigorously tested for confirm the ingredients used and also for contaminants and they consistently get the highest ratings.
http://www.bodybuilding.com/store/best-organic-protein-supplements.html
- here's a link speaking about the quality of protien you need for muscle growth, the different types of protien, and the timing of when it should be ingested.
http://www.muscleforlife.com/how-much-protein-build-muscle/