First... you must be able to and have mastered meditation. If you cannot meditate then you will have no success with this project of time travel.
You must go into your meditative state and clear your mind of all outside thoughts. Now here comes the important part.... you need to have a special place to go to when you are in this state of mind.... in other words.... imagine a building in the middle of a field or in the middle of nowhere surrounded by nothing. You will use this same building every time you want to do this. The building can be any shape, square or pyramid or whatever. It must also have no windows... this way you will not be disturbed by anything outside of it. The inside of this building can be as simple or as plush as you wish it to be. The simpler it is... the less distractions you will have. Just make sure it is the same every time.
Now... inside this building will be a room where you have a chair. This chair is a special chair... it is a big black recliner with controls built into the arm of the chair. These controls are buttons that will take you where you want to go. You may set up these buttons in any configuration. For instance --- a past button --- a present button -- and a future button... and for even more control... an LED display with a number key pad... this will be for punching in the exact year in time you wish to travel to. If you do not want to use a chair you may imagine some big elaborate machine that you sit in (your own time machine) with all the same controls.
In this room will also be a big giant movie screen. You can even have a button on your chair that makes it come down from the ceiling. This screen is where you will be watching the time frame you have chosen. Try to think of how you want all these items-- the building... the chair or machine... the screen.... before you you actually go into meditation. Predetermine how you want them all to look beforehand.
Now that you have all these thing ready in your mind... it is time to get started!
Go into your meditative state. When you are totally relaxed... take a mental walk to your special building and close the door. Sit in your special chair or machine and relax for a few more minutes. When you are ready... push the button that makes your screen come down from the ceiling and just sit there and stare at it for a minute. When you are ready, dial in what time period you want to travel to and or what country you want to go to. Now... just sit there and do not try to force this.... only sit there and wait for it to come up on the screen and relax and observe what is being shown to you. If you are impatient.... it will not happen! It may take several days of trying before you actually see anything but, it will happen!
When you want to come back... just push the buttons for the present on your chair and take a few minutes to evaluate everything you saw. then when you are ready get up out of your chair and walk out of the building and back to your physical body.
This method can be used to have spirits show you things you need to learn... just go through the same process and ask the spirits to show you on the screen what you want to know.