2015 TB145 will be indistinguishable from faint stars, but it is moving fast. Between October 30 and 31, it will change position with respect to the fixed stars within hours or even minutes. You'll need good finding charts to identify it, though. Here's a short tutorial how to find this (or any other) asteroid with the free program Stellarium (available also as smartphone app).
|At my location, 2015 TB145 will be visible in Orion's shield on the morning of October 31.|
Mark "Asteroids" and select "Download a list of objects from the internet". As "Source from the list" select "MPCORB: near-Earth asteroids (NEAs)" and hit "Get orbital elements". After the download is finished, search for "2015 TB145", mark the asteroid and hit "Add objects". (You may, of course, add more objects.)
Almost done. Close the Solar system editor and go back to the main screen. To find 2015 TB145, just hit F3 and enter "2015 TB145". The asteroid will be marked with a red, pulsating cross,
By choosing date and time, you can now easily find out if, when and where 2015 TB145 can be seen from your specified loaction. Zoom in to see nearby stars.
Stellarium also supplies an estimation of the asteroid's apparent magnitude at any moment. Note that due to geometry reasons, 2015 TB145 will be brightest around 12:30 UT on October 31, when Europe is in daylight.
Update: It has been pointed out to me that due to deflection by Earth's gravitation, the orbital elements of the asteroid will change on October 30/31. There may be deviations up to several arcminutes. So positions given by Stellarium will not be accurate to the arcsecond, but nevertheless should suffice to point a telescope/camera to the right direction.