Kyoto to Hakata on Apr 29th

I will arrive in Kyoto on Apr 25th. I plan to take the train from Kyoto to Hakata (Fukuoka) on Apr 29th (beginning of golden week). Please tell me what I should expect in terms of train travel on Apr 29th (Wed). What's the chance of getting seat reservation made successfully ?

Depends on dep time.
http://www.japan-guide.com/forum/quereadisplay.html?0+122040

Generally, as soon as you arrive in Kyoto then try to reserve a seat.

Every year is different. But if you try really early, you have a shot at getting a good seat.
Hakata is a fun place to see for a few days. Be sure not to miss the beautiful Nanzoin Temple; it is a hidden gem that few know about:

https://www.youtube.com/watch?v=lT4VQFmHFyM

You also might look into the Fukuoka Tourist City Pass:
http://yokanavi.com/access_tourist_eg

For lots of other ideas on good places to see, try looking through:

http://www.thejapanfaq.com/fukpic.html

https://www.youtube.com/playlist?list=PL7LcPcmoSg-j4RLa6iC7ayvBAbOn8-0...