In my opinion, yes, because unless you had relatives or friends in Egypt, you have to realize that traveling there alone or in couple or even in a small group could have security issues taking into account that with all probability you are coming from a western country with hard currencies and valuable goods, so first advice do not become an easy target for criminals.
Furthermore, take into account when traveling to Egypt that very probably you are going to come into the Country through the Cairo Airport, which is a modern facility, but bear in mind that just outside of the premises do not expect to find a large number of community transports, because you will find only taxis, and in theory, buses lines that are not very recommendable. If you are going to hire a taxi, first negotiate the price.
The reason why a do recommend you a travel agency it is because they are very efficient in general, fairly used to help tourist and what it is paramount for visiting sites, they will take you there; they will give you valuable information about places, and they will deliver you in safety to your hotel. Because bear in mind that in Egypt, you cannot expect a public transport means to visit all the historical places.
So, when arriving and beginning your journey, best hire in advance the services of a travel agency or at least a transfer provided by your hotel. It is best to pay for a private transport as a safer and more comfortable way to begin your staying in Egypt, and make it an unforgettable memory.