I don't care how you time travel, but for the love of GOD, please keep in mind that the planet is moving. Fast.
In the time it takes you to fall off a barstool and hit the floor, the Earth's spin will take you about half a mile east, the motion of the Earth around the Sun will carry you forty miles back West, the drift of our solar system will carry you twenty miles closer to the star Vega, and the spinning pinwheel of our galaxy will take you an additional 300 miles around our galactic center. More or less.
If you travel in time without traveling in space, you are going to end up in the void of space.
The only movie I have ever seen deal with this problem (and it did so poorly) was Primer.
Primer (film - Wikipedia, the free encyclopedia)
GREAT movie, BTW.