You can easily travel alone through specific trails like Ghorepani-Poonhill, Langtang Valley, and Dhampus-Ghandruk. Many tourists visit these trails that have several teahouses and other infrastructures. The route is easy as well. You may as well trek to other regions alone, but we do not advise it because you will be prone to accidents and the risk of getting lost. If you are traveling in a remote region, it will be much easier for you if you hire a guide cum porter. However, make sure that your guide is associated with a reputed agency and is experienced.