You do have many options when looking for help for mechanical engineering. Not all of them are equal in quality. Great help needs to fit into a couple of different criteria. You want them to be knowledgeable in the field. You want to have access to solutions that will fit into your busy schedule. You will want it to fit within a budget that you set for yourself. Once you have established that these criteria are met, you will want to look into several different solution options.
Your library, either in your school or in your neighborhood, can offer you books or research papers on mechanical engineering that you may not be able to access online. You will see how others worked through the problems and find the solutions on your own. You will be able to deepen your understanding with a little dedication to learning procedures.
If you are choosing to go with a tutor, you will need to find out if you will have references from their prior students. You will want to make sure that they know the field well and that they know how to show others how to find solutions. You do not want to walk away from a tutoring session more confused than before you went. There is no reason for you to hesitate in getting the help that you need. Your future depends on you finding solutions for your mechanical engineering needs. Focus on reliable places that you can see their background, rather than something that just sounds good. You will be glad that you did.