On the complex issue of time travel

[abc10011]

No: HPFGUIDX 56412

I think that there are 2 ways that time travel could happen.
1)The actual person from the past goes back in time when he is in the 
future.
2)A different person, the person from the future (NOT the same actual 
person from the past) goes back in time.
According to the first way of understanding the question arises how 
is it possible that a person can save their past selves, how did they 
survive to be able to go save themselves.  I think that if we say 
that time is not being made anew and it is instead already done and 
we are just progressing through it, then there is no before and after 
and therefore my question is answered.  The truth is that if now I 
can see someone from later then it must be that later happened 
already because if not, later didn't happen yet for him to come back 
to now from later.
However I do believe it is possible to disprove the first way of 
understanding as follows.  It states that wizards have killed their 
past selves, well if it is the actual person from the past then if he 
is killed how was the wizard alive at the time that he went back.  
For ex. I went back at 5:00 to 2:00 and killed my past self at 3:00, 
so how was I there at 5:00 to go back in time, therefore it must be 
that the person who goes back in time is a "different" person and its 
like the second way of understanding.
I do not profess to understand the second way and the truth is that 
the first way makes more sense but the proof is there.
WHEW!
Joe *who has a pounding headache*