how will a stock TE 4runner do on those trail?
The TE is quite the off-road machine even in stock form. Tires will be lacking, but you'll get over some pretty surprising stuff, even with the factory rubber.
You will need to keep an eye out on front and rear bumpers as well as your rocker panels. If you have any kind of steps installed (steps, not sliders), they will likely be your most limiting factor.
Someone experienced out at HF plus a good spotter will be a major help and will keep you out of any worry of body damage.
There's a great opportunity coming up. My local club, Heart of Texas Off-Road Club, is hosting an event there the weekend of September 19th called "FJ Fallout". It started as, uhhh, an FJ event, but they're open to everything Toyota. There are usually quite a few stock rigs and planned, organized runs for beginners with experienced guides and spotters.
I can post a link if you're interested in registering. If not, there are a couple of us on here that are local and pretty open to wheeling out there most weekends.
EDIT: Just noticed you're in Houston. HOTORC has a Houston chapter as well. Look us/them up on FB.