[Q] Removing Carrier Firmware


I need help.

Can anyone please offer me their time/experience to solve this problem and answer these questions? I would greatly appreciate it.

Before posting I searched the forum but could not find a solution. I read
"How to Change carrier specific (Videotron) firmware to original Google firmware?" and other threads but I don't think any apply to my situation.

I live in Japan but don't speak a word of this language and wish to retain original English setup.

My Jap carrier, Softbank, offers huge discounts to buy HTC Desire HD but their phone has Softbank Firmware.

I would like to retain HTC SENSE environment which is present on the phone:
Delete the present keyboard - this one has the option to switch between kanji & normal - and install a normal SENSE English Keyboard
Use swipe in English (and possibly in Italian)
Update to the latest SENSE firmware every time it comes out
Unlock the phone (it's Sim locked) to be able to use other carrier's sim
Access Internet with Softbank's flat rate data access (if I use NON Softbank phones, for some reason, I am charged astronomical fees)
Wipe off all the japanese crap (apps & settings) from the phone.

Can anyone help me with any or all my issues? Please? May I also ask someone to explain to me what's the difference between rooting and flashing?



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