No it's laughably easy. Seriously. Arrive at the system, come to a dead stop facing the star. Fly towards it slowly. When you're about 0.4ls away turn left or right and slide yourself gracefully into the jet, heading AWAY from the star. Make sure you're going nice and slow so that you don;t get thrown out of the jet before you've charged up and after about five seconds you'll get the 'frameshit drive supercharged' message. Hit full throttle and fly out. Don't try to get out of the jet immediately, just fly out of the end of it.
The only thing (
literally the only thing) that will kill you is heading into the jet facing the star. All I do to be safe is select the star itself before I approach. Keep an eye on the compass on the left of your HUD and make sure the star is hollow not filled when you enter the jet - if it's hollow it's behind you. It doesn't matter if it's directly behind you, or if it's one degree from being in front of you because when you're in the jet, you will never get turned round past the 180 degree line - if the star is behind you when you enter the jet it will stay there.
Easiest and cheapest way to practice is just head to Jackson's Lighthouse in the bubble in a sidewinder. That way you can get blown up as many times as you like with no consequences. It has the added advantage that the Sidewinder gets thrown about worse than any other ship in a neutron star jet so when you get used to it in a sidey, doing it in a medium ship is fine and doing it in something like an anaconda is a cakewalk.
Note - all of this applies to neutron stars. If you want to charge up at a white dwarf make sure you have rebuy, cross your fingers and say a prayer. White dwarfs are the devil's work.