Advice to get from London to Goodwood FoS

[kobefly]

Hello everyone! It's me once again seeking for advice on attending racing events in Europe (I am from Argentina).

This year I will be going to Goodwood Festival of Speed on Thursday (first day) and Sunday (last day) but I will be staying at London (Soho area to be more accurate).

Per my research I should get the Southern train in direction to Southampton Central from Victoria Station and get out at Chichester Station and, from there, I read that a bus (service 902) runs to the venue starting at 7am every 30 minutes.

Some questions I have are:
1) Is it possible to be in Cichester by 7am? I did not see trains leaving that early from London
2) Is there any advice you can give me to do this trip?

I would really appreciate the help of those of you having done this or at least know all this areas.