I had a similar question recently when fitting the headset in my Dawg, as Dave said the standard press won’t fit 1.5″ cups, also the upper cup on my frame was a 1 1/8″ semi int which i’m not convinced the press would do either so I didn’t bother buying one.
If you decide to go for one, they’re very cheap on rose bikes (think they might be a bit cheaper than wiggle).
I ended up with the old hammer / threaded bar with big washers and sockets. Went in fine but had to change my pants afterwards. The addition of sockets to spread the load to the outside of the washers made the cups go in much straighter than just with washers, I think they helped to keep the bar straight. 🙄