Okay, I think my sleep issues have finally managed to leave me coherent enough to give proper feedback on the Thermal Expansion stuff. (Insomnia sucks, so much.)
For Engines, it's probably best to craft a single Stirling Engine to get the first TE machine started. After that, a player should switch to better engines, ones that don't become obsolete. The Hobbyist Steam Engine is not a Thermal Expansion item, but it is perfectly compatible and fits into the tech tree just fine. It is so cheap and so efficient that it's probably best listed as an alternative starting engine to the Stirling Engine, recommended over it if the player can find an extra 2 Gold for it by the time they're ready to craft their first machine. The TE Steam Engine is more powerful, but the Hobbyist Steam Engine is worth making because it provides A LOT more bang for your buck as well as never going obsolete due to surpassing the TE Steam Engine once a player starts producing Steam from a Boiler. The two Gold Nuggets it needs are a non-issue in the long run due to the pretty reliable drop rates from both vanilla Zombie Pigmen and the Twilight Forest Kobolds.
The Pulverizer should be moved into the same section as the Stirling Engine as it's pointless to make an Engine before you can make the Pulverizer. That said, It should probably say something like "Pulverizer/Induction Smelter". Both of them will double ore output, but they each have pros and cons, but both will be needed along the way, and in fact the Induction Smelter is probably the better machine to start with. The Induction Smelter has a 20% chance when processing Ore to yield Rich Slag as opposed to the Pulverizer's 5% chance for an extra bit of Pulverized Metal depending on the Ore being processed. The Rich Slag can be converted into any metal when run back through the Smelter with two piles of Pulverized Metal of the desired type. The Induction Smelter is also faster and combines the extra ore yield and the smelting steps together for even better processing efficiency. On the other hand, it requires Sand as a catalyst, and the Rich Slag cannot be turned into an ingot without pulverizing something first, whether it be an ore or an already smelted ingot.
How to condense this... "The Pulverizer and the Induction Smelter are both TE's high yield ore processing machines. They have slightly different roles to play in a finished factory, but either one can serve as a good starting point. The Induction Smelter is more effective overall, but the Pulverizer is needed eventually to provide renewable Sand and to actually enable the Induction Smelter to make use of its Rich Slag. Remember that the Pulverizer can work on already smelted ingots for this purpose."
The third section should be where the Aqueous Accumulator should be listed, along with the TE Steam Engine as they work well together and that is a good time to start making them. It could also include the Igneous Extruder for (nearly) fuel free Stone production, Cobblestone generation without need to wear down any tools to collect it, and Obsidian for crafting an Enchanting Table without any need of a Diamond Pick. (Easier than the mold method for assembling a Nether Portal as well.) This section is also a good place to mention that a Peat Farm can be operated manually and without the need of machines other than the Pulverizer for renewable Sand. I'm trying not to nitpick individual lines as you didn't say you wanted a proofreader/editor, but I reeeeeally think the line "and allows you to cut up some items for parts" needs to be reworded to "and allows you to recycle various wood items."
The fourth section should list the Magma Crucible and Magmatic Engines as a way to generate highly efficient and effective power once the player has secured access to the Nether and its bounties of Netherrack and the lava lakes themselves. This is the best source of power until Fuel production is started, Forestry biomas production reaches sustainability, or the player manages the infrastructure necessary to maintain a Boiler.