I've owned and maintained an LLC for about the last 3 years. I own 99% of it and 1% is controlled by my father. I did this so I could continue to maintain the protection that the LLC structure offers. In the event that I would ever get sued my personal assets should be shielded from the lawsuit. (Not that I plan to get sued but you can never be too careful).
I was able to incorporate in the State of Pennsylvania (where I live) for a filing fee of $125. I was also able to to register for an EIN with the IRS for free. From there I opened a bank account and got moving. I do limited consulting from time to time as well as manage a couple of servers for some folks. I keep everything totally separate. At the end of the year I work with a local accountant who charges me $125 to $200 to complete my LLC taxes with the State and the Fed.
There are some inherent benefits to having an LLC. I'm able to purchase business equipment such as laptops, computers, supplies, etc... with pre-tax money which lets my dollars go much further.
Additionally other businesses automatically seem to take me more seriously when I reach out to them for software, equipment, services or as a potential client.
If you are already tracking your spending it's honestly not a lot of work. You just have to keep track of your income and expense for your business. If you are small a spreadsheet and some folders for paperwork will work just fine.
The LLC structure has been extremely easy for me to manage and most months I don't even think about it. The only advice I have is avoid those "we incorporate you" websites. Chances are pretty good if you do a little bit of research you will be more then able to handle this yourself. Also reach out to the state that you are incorporating in, you'll be surprised at how helpful they can be with the process.
Let me know if you have any questions or concerns, I'm happy to help.