There are lots of different places you can find Pomodoro timers. Whether it be through videos on YouTube or a website like Life at Virtual Spaces, Pomodoro timers are great for not overworking yourself or being stressed about having to commit to insane amounts of time all at once. Sometimes, sitting down to start a huge project can feel scary because you feel like you have to do it all at once, but Pomodoro timers are a good way to break up the time. My biggest piece of advice with pomodoro timers is to not force yourself to use them. They may not work for you, and that is okay! 

For some people it can be really hard to conceptualize how long a block of time actually is. This is where using a visual timer can be helpful. it allows you to physically see how much time you have left, in relation to the amount of time you have already spent. I know for me, seeing the time tick down gives me more anxiety than anything else, so I don't use visual timers, but I know plenty of people who absolutely adore them.