Thats not a press fit. Its a Hollowtech II external bearings. Cheaply and easily replaced.
Unfortunately, since the bearings are pretty much exposed to the elements, they really do not last long. Especially if you do a lot of wet weather riding.
All you need is a HTII bottom bracket tool such as this. Used with an adjustable spanner.
To get the crankset off you undo the 2 retaining bolts. You will then need to undo the plastic bolt with one of these. Couple of quid from
Wiggle or such like. Lift up the tap and pull the crank off.
Pull the crankset from the other side. It may need a little help with a rubber mallet or such like.
Then you can access the bottom bracket on both sides.
You can check if they have any roughness to the bearings by using your fingers to turn them. If they feel rough, you know they need replacing.