Focus in the job, and multitask and make sure the deadline is taken care of. In the company its good to learn lots of things like willing to share and make or do some office proposal to help and promoted the company by suggested good idea. To deal with all your co-worker no matter how busy u are u have to communicate and help each other in order to build a good relationship in the workplace environment
There's no hardest part of the job if you know how to deal all of them and handle the problem in the proper way. In this case at the end of the day you can promoted your self as a good model in the company. The most enjoyable in the job is you really like what you doing and share your good ideas to people who needs your service and be polite all the time no matter how busy you are.