Tamiya and Hasegawa are easy to pronounce, since the Japanese language only has 5 vowel sounds!
A - like the u in mud, but you have to open your mouth wider
E - like the e in get
U - like the oo in toot
I - like the ee in meet, but just a tad shorter
O - like the o in orange
So Tamiya is pronounced tum-EE-yuh
Hasegawa is huh-seh-GAH-wah
(The uppercase letters denote the stress.)