Mt. St. Helens without any real prior scrambling experience?

Today out of pure curiosity I was checking recreation.gov and I found a permit for Mt. St. Helens for tomorrow and impulse-bought it. I was wondering how hard it is to solo it in a day with no prior scrambling experience? I’ve heard that the boulder field can be challenging.

I wouldn’t say I’m in super great shape, but I did Larch Mountain, Defiance, and South Sister recently without any issues. How much harder is Mt. St. Helens than those two? Also is there anything I should remember (besides don’t stand too close to the rim and don’t walk on cornices)?

Thanks in advance for the help. Normally I’d do more research but this was kind of a last-minute impulse thing.