Everyone is born with their own Guides assigned to them before they are born, you also have a preordained blueprint to follow in your life as your path.
The journey down this path is sometimes rocky, has roadblocks, walls, doors, stairs and tunnels. Adversity on this path is for a reason, it is to make us stronger. Our Guide is there to help us along the way. Many don't realize that because they do not hear or see their Guide, that their Guide is truly there with them always.
You get your guidance, messages through your intuition and your dreams. What your heart tells you to do for your greater good is your guide's guidance along with this..
Trust your Intuition for it is your guide's way of connecting with you even though you don't realize you have someone guiding you! Some people are "Chosen" before birth to be able to see and speak to their guides, they have a "special purpose" on their path.
There is no limit to the number of guides that can be with you at any given time.. There are different levels of Spirit Guides, some are 'Master Guides' who'll only come to a person a few times in their life they use your Spirit Guide to get messages to you.
There are Lower Level Guides such as your Spirit Guide that is always close to you....in another dimension but by your side, merely 3 feet above the ground. Anyone who does see their guide will see them as being Very Tall or in the Air this is because their feet would never touch the ground.
These Guides differ only in their level of "enlightenment" developed through their assignments given them by God. The spirit of a lost Loved One around you is called a "Joy Guide" they will come to you to help and comfort you and guide you also..
These are just a few examples to help you understand..there is much much more to the Spirit Guides and the part they play in our lives. More than anyone will ever know.
Most people will find that through their spirituality and their faith they can make this connection with their guide and develop it.
It takes strong faith in the believe that this Can and Will happen, same for those who do not see or hear theirs, using your faith and prayer will make your connection stronger, your intuition and confidence will grow this is you responding to your Guide's guidance. Everyone is Unique in their connection with their own guide just as each human is unique.