Lets think about some of the more visceral personal-level details, too...
Do you risk taking the time to properly secure your ship to theirs? Have they got workign guns? Or do you try to jump across? Even if you have a safety line, if you miss you are either a sitting duck or no use to the fight. When you hit and secure yourself an entry point to the target ship you still have to spend the few seconds unclipping from your line - and every second counts.
How do you get in? Override? Best hurry. Stationary targets are a bad idea. And if you are on the outside of an airlock, or nearby it, and the target crew emergency-open the outer airlock doors without depressurising the outblast of air might knock you off the ship. It won't hurt, but if you aren't tethered on you had better hope your guys like you enough to come get you. Gonna get in by blowing the wall or airlock? Don't screw up - your vacc suit is awfully fragile.
As soon as you go in, by any entrance, any movement could be hostile, any shadowed corner could hold a booby trap. If the crew of the target are in defensive positions they know that anything they see they can shoot - you probably have to check your targets first if you have other teams sweeping the ship. Any delay can be fatal.
You are in your vacc suit or combat armour. The helmet, even if its all transparent, robs you of a lot of your feeling of perception. Your own breath, and you will be breathing fast and hard as adrenaline kicks in, will be all you can hear clearly. Every muffled noise will leave you looking for a threat to come. Claustrophobia inside your suit can kick in as a natural amplification of the fight or flight reflex adrenaline brings - especially for the jumpy rookie on your entry team.
If the target is smart they have opened the corridors to vacumn, 'cause all they have to do then is put a hole or three in your vacc suit and you have more important things on your mind than attacking them even if your armour vest stopped the rounds form entering your body.
If you want the ship you have to worry about where your rounds go. Even if you don't want the ship, firing indiscriminately in some parts of the ship can break coolant pipes, reactor seals, and a whole ton of unpleasant things. using lasers to avoid damaging the ship? Better hope the target crew aren't behind big solid objects.
Speed is of the essence, because the longer you give the target crew, the better prepared they are. And their preparation makes you bleed.
Its nasty stuff going room to room, and entering hostile areas.
Hope these are useful.
Regards,
Shane